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 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
acre
Jun. 30, 2012
Dec. 31, 2012
Jun. 30, 2013
Tatex Thailand II, LLC [Member]
Jun. 30, 2013
Tatex Thailand II, LLC [Member]
Dec. 31, 2012
Tatex Thailand II, LLC [Member]
Jun. 30, 2013
Apico Llc [Member]
Jun. 30, 2013
Tatex Thailand III, LLC [Member]
Jun. 30, 2013
Tatex Thailand III, LLC [Member]
Jun. 30, 2012
Tatex Thailand III, LLC [Member]
Dec. 31, 2012
Tatex Thailand III, LLC [Member]
Jun. 30, 2013
Grizzly Oil Sands ULC [Member]
Jun. 30, 2012
Grizzly Oil Sands ULC [Member]
Jun. 30, 2013
Grizzly Oil Sands ULC [Member]
acre
Jun. 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]
Jun. 30, 2013
Bison Drilling And Field Services LLC [Member]
Jun. 30, 2012
Bison Drilling And Field Services LLC [Member]
Jun. 30, 2013
Bison Drilling And Field Services LLC [Member]
Jun. 30, 2012
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]
Jun. 30, 2013
Muskie Holdings LLC [Member]
Jun. 30, 2012
Muskie Holdings LLC [Member]
Jun. 30, 2013
Muskie Holdings LLC [Member]
Jun. 30, 2012
Muskie Holdings LLC [Member]
Dec. 31, 2012
Muskie Holdings LLC [Member]
Dec. 31, 2011
Muskie Holdings LLC [Member]
Jun. 30, 2012
Timber Wolf Terminals LLC [Member]
Jun. 30, 2013
Timber Wolf Terminals LLC [Member]
Dec. 31, 2012
Timber Wolf Terminals LLC [Member]
Jun. 30, 2013
Windsor Midstream LLC [Member]
Jun. 30, 2012
Windsor Midstream LLC [Member]
Mar. 31, 2012
Windsor Midstream LLC [Member]
Jun. 30, 2013
Windsor Midstream LLC [Member]
Jun. 30, 2012
Windsor Midstream LLC [Member]
Dec. 31, 2012
Windsor Midstream LLC [Member]
Jun. 30, 2013
Windsor Midstream LLC [Member]
MidMar Gas LLC [Member]
Jun. 30, 2013
Stingray Pressure Pumping LLC [Member]
Jun. 30, 2012
Stingray Pressure Pumping LLC [Member]
Jun. 30, 2013
Stingray Pressure Pumping LLC [Member]
Jun. 30, 2012
Stingray Pressure Pumping LLC [Member]
Dec. 31, 2012
Stingray Pressure Pumping LLC [Member]
Jun. 30, 2013
Stingray Cementing LLC [Member]
Dec. 31, 2012
Stingray Cementing LLC [Member]
Jun. 30, 2012
Stingray Cementing LLC [Member]
Jun. 30, 2013
Blackhawk Midstream LLC [Member]
Jun. 30, 2012
Blackhawk Midstream LLC [Member]
Jun. 30, 2013
Blackhawk Midstream LLC [Member]
Jun. 30, 2012
Blackhawk Midstream LLC [Member]
Dec. 31, 2012
Blackhawk Midstream LLC [Member]
Jun. 30, 2013
Stingray Logistics LLC [Member]
Dec. 31, 2012
Stingray Logistics LLC [Member]
Jun. 24, 2013
Diamondback Energy LLC [Member]
Jun. 30, 2013
Diamondback Energy LLC [Member]
Jun. 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]
Jun. 30, 2013
Stingray Energy Services LLC [Member]
Mar. 31, 2013
Stingray Energy Services LLC [Member]
Jun. 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%     22.50%     28.40%   50.00%   50.00%       50.00%   50.00%   50.00%     50.00%   13.50% 13.50%       21.40% 50.00%   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     $ 901,000 $ 200,000   $ 200,000 $ 400,000                                                                     $ 698,000                                                            
Equity method investment, percentage of remaining interest                     68.70%                                                                                                                          
Equity investments 438,864,000   438,864,000   381,484,000       203,000   9,138,000 9,138,000   8,657,000 176,876,000   176,876,000   172,766,000     13,816,000   13,816,000     13,518,000       8,453,000   8,453,000   7,320,000     870,000 878,000 9,664,000     9,664,000   9,503,000   15,399,000   15,399,000   13,265,000 3,041,000 3,110,000   0   0   0 900,000 947,000   198,662,000 198,662,000 151,317,000 138,500,000     2,045,000   2,045,000 0  
Sale of Stock, Price Per Share                                                                                                                         $ 34.75                      
(Income) loss from equity method investments 50,108,000 (360,000) 111,318,000 (628,000)   200,000 200,000     100,000 100,000 100,000   (800,000) (300,000) (1,300,000) (600,000)       200,000 300,000   300,000           (400,000) (100,000) (800,000) (100,000)           474,000 59,000   858,000 115,000     319,000 100,000 (400,000) 100,000   69,000.00     100,000 200,000 100,000 200,000   100,000     51,400,000 112,500,000         103,000   138,000    
Cash calls paid                     600,000         15,100,000             300,000                 1,900,000                               1,800,000               100,000                                
Increase (decrease) due to foreign currency translation adjustment                           (6,100,000) (2,900,000) (9,700,000) (1,900,000)                                                                                                              
Shares sold                                                                                                                         1,951,781                     282,755
Net sales proceeds     (65,111,000) 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%                                                                                      
Payments for equity method investments     21,960,000 101,864,000                               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)                                                                                                                           $ 33.32 $ 33.32