Quarterly report pursuant to Section 13 or 15(d)

Equity Investments (Narrative) (Details)

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Equity Investments (Narrative) (Details) (USD $)
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
acre
Sep. 30, 2012
Dec. 31, 2012
Sep. 30, 2013
Tatex Thailand II, LLC [Member]
Sep. 30, 2013
Tatex Thailand II, LLC [Member]
Dec. 31, 2012
Tatex Thailand II, LLC [Member]
Sep. 30, 2013
Apico Llc [Member]
Sep. 30, 2013
Tatex Thailand III, LLC [Member]
Sep. 30, 2013
Tatex Thailand III, LLC [Member]
Sep. 30, 2012
Tatex Thailand III, LLC [Member]
Dec. 31, 2012
Tatex Thailand III, LLC [Member]
Sep. 30, 2013
Grizzly Oil Sands ULC [Member]
Sep. 30, 2012
Grizzly Oil Sands ULC [Member]
Sep. 30, 2013
Grizzly Oil Sands ULC [Member]
acre
Sep. 30, 2012
Grizzly Oil Sands ULC [Member]
Dec. 31, 2012
Grizzly Oil Sands ULC [Member]
May 15, 2012
Bison Drilling And Field Services LLC [Member]
Apr. 30, 2012
Bison Drilling And Field Services LLC [Member]
Sep. 30, 2013
Bison Drilling And Field Services LLC [Member]
Sep. 30, 2012
Bison Drilling And Field Services LLC [Member]
Sep. 30, 2013
Bison Drilling And Field Services LLC [Member]
Sep. 30, 2012
Bison Drilling And Field Services LLC [Member]
Dec. 31, 2012
Bison Drilling And Field Services LLC [Member]
Sep. 30, 2011
Bison Drilling And Field Services LLC [Member]
May 15, 2012
Bison Drilling And Field Services LLC [Member]
Minimum [Member]
May 15, 2012
Bison Drilling And Field Services LLC [Member]
Maximum [Member]
Sep. 30, 2013
Muskie Holdings LLC [Member]
Sep. 30, 2012
Muskie Holdings LLC [Member]
Sep. 30, 2013
Muskie Holdings LLC [Member]
Sep. 30, 2012
Muskie Holdings LLC [Member]
Jul. 02, 2013
Muskie Holdings LLC [Member]
Dec. 31, 2012
Muskie Holdings LLC [Member]
Dec. 31, 2011
Muskie Holdings LLC [Member]
Sep. 30, 2012
Timber Wolf Terminals LLC [Member]
Sep. 30, 2013
Timber Wolf Terminals LLC [Member]
Dec. 31, 2012
Timber Wolf Terminals LLC [Member]
Sep. 30, 2012
Windsor Midstream LLC [Member]
Mar. 31, 2012
Windsor Midstream LLC [Member]
Sep. 30, 2013
Windsor Midstream LLC [Member]
Sep. 30, 2012
Windsor Midstream LLC [Member]
Dec. 31, 2012
Windsor Midstream LLC [Member]
Mar. 31, 2012
Windsor Midstream LLC [Member]
MidMar Gas LLC [Member]
Sep. 30, 2013
Stingray Pressure Pumping LLC [Member]
Sep. 30, 2012
Stingray Pressure Pumping LLC [Member]
Sep. 30, 2013
Stingray Pressure Pumping LLC [Member]
Sep. 30, 2012
Stingray Pressure Pumping LLC [Member]
Dec. 31, 2012
Stingray Pressure Pumping LLC [Member]
Jun. 30, 2012
Stingray Pressure Pumping LLC [Member]
Sep. 30, 2013
Stingray Cementing LLC [Member]
Dec. 31, 2012
Stingray Cementing LLC [Member]
Jun. 30, 2012
Stingray Cementing LLC [Member]
Sep. 30, 2013
Blackhawk Midstream LLC [Member]
Sep. 30, 2012
Blackhawk Midstream LLC [Member]
Sep. 30, 2013
Blackhawk Midstream LLC [Member]
Sep. 30, 2012
Blackhawk Midstream LLC [Member]
Dec. 31, 2012
Blackhawk Midstream LLC [Member]
Jun. 30, 2012
Blackhawk Midstream LLC [Member]
Sep. 30, 2013
Stingray Logistics LLC [Member]
Dec. 31, 2012
Stingray Logistics LLC [Member]
Jun. 24, 2013
Diamondback Energy LLC [Member]
Sep. 30, 2013
Diamondback Energy LLC [Member]
Sep. 30, 2013
Diamondback Energy LLC [Member]
Dec. 31, 2012
Diamondback Energy LLC [Member]
Dec. 17, 2012
Diamondback Energy LLC [Member]
Oct. 11, 2012
Diamondback Energy LLC [Member]
Jun. 30, 2012
Diamondback Energy LLC [Member]
Sep. 30, 2013
Stingray Energy Services LLC [Member]
Mar. 31, 2013
Stingray Energy Services LLC [Member]
Sep. 30, 2013
Stingray Energy Services LLC [Member]
Dec. 31, 2012
Stingray Energy Services LLC [Member]
Jul. 05, 2013
Subsequent Event [Member]
Diamondback Energy LLC [Member]
Schedule of Equity Method Investments [Line Items]                                                                                                                                                  
Ownership interest           23.50% 23.50%     17.90% 17.90%     24.9999%   24.9999%         40.00%   40.00%     25.00%                 25.00%   50.00%     22.50%       28.40%           50.00%     50.00%           50.00%   50.00%   12.10% 12.10%       21.40%   50.00%      
Equity shares owned by affiliate (shares)                 85,122                                                                                                                                
Total shares owned of subaffiliate (shares)                 1,000,000                                                                                                                                
Gas and oil area, reserve (acres)     243,000                         800,000                                                                                                                  
Distributions received     $ 203,000 $ 710,000   $ (200,000) $ (600,000)                                                                                                                                    
Equity method investment, percentage of remaining interest                     68.70%                                                                                                                            
Equity investments 500,679,000   500,679,000   381,484,000       203,000   10,871,000 10,871,000   8,657,000 189,943,000   189,943,000   172,766,000     12,559,000   12,559,000   13,518,000       8,650,000   8,650,000     7,320,000     870,000 878,000     10,379,000   9,503,000   17,755,000   17,755,000   13,265,000   3,345,000 3,110,000   0   0   0   978,000 947,000   242,174,000 242,174,000 151,317,000 138,500,000     3,155,000   3,155,000 0  
Sale of Stock, Price Per Share                                                                                                                           $ 34.75                      
(Income) loss from equity method investments 51,322,000 (1,165,000) 162,640,000 (1,793,000)   200,000 400,000     (100,000) (200,000) 200,000   (800,000) 300,000 2,100,000 900,000       (1,300,000) (100,000) (1,300,000) 200,000         100,000 100,000 900,000 200,000             100,000   872,000 200,000     300,000 (400,000) (700,000) (500,000)           (200,000) (100,000) (300,000) (400,000)           52,900,000 165,400,000         200,000   100,000    
Cash calls paid                     2,400,000         25,100,000             300,000               2,200,000                               1,800,000                 300,000                         700,000   700,000    
Increase (decrease) due to foreign currency translation adjustment                           3,900,000 5,300,000 (5,800,000) 3,400,000                                                                                                                
Shares sold                                                                                                                           1,951,781                     282,755
Net sales proceeds     (74,544,000) 0                                                                                                                   65,100,000                     9,400,000
Loans receivable, description of variable rate basis                                     LIBOR                                                                                                            
Loans receivable, basis spread on variable rate                                                     0.28% 8.00%         2.50%                                                                                
Loan receivable                                                                 900,000                                                                                
Payments for equity method investments     34,936,000 118,975,000                               6,200,000                               1,000,000       7,000,000                                                           2,200,000      
Amount loaned during period                                               1,600,000                                                                                                  
Investment (shares)                                                                                                                                     7,914,036            
Promissory note receivable                                                                                                                                     $ 63,600,000            
Share price (usd per share)                                                                                                                             $ 42.64 $ 42.64