Annual report pursuant to Section 13 and 15(d)

Equity Investments (Investments Accounted For By The Equity Method) (Details)

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Equity Investments (Investments Accounted For By The Equity Method) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 17, 2012
Jun. 30, 2012
Schedule of Equity Method Investments [Line Items]          
Equity investments $ 440,068 $ 381,484      
(Income) loss from equity method investments (213,058) (8,322) 1,418    
Tatex Thailand II, LLC [Member]
          
Schedule of Equity Method Investments [Line Items]          
Approximate Ownership percentage 23.50%        
Equity investments    203      
(Income) loss from equity method investments 343 7 7    
Tatex Thailand III, LLC [Member]
          
Schedule of Equity Method Investments [Line Items]          
Approximate Ownership percentage 17.90%        
Equity investments 10,774 8,657      
(Income) loss from equity method investments 254 251 172    
Grizzly Oil Sands ULC [Member]
          
Schedule of Equity Method Investments [Line Items]          
Approximate Ownership percentage 25.00%        
Equity investments 191,473 172,766      
(Income) loss from equity method investments 2,999 1,512 1,592    
Bison Drilling And Field Services LLC [Member]
          
Schedule of Equity Method Investments [Line Items]          
Approximate Ownership percentage 40.00%        
Equity investments 12,318 13,518      
(Income) loss from equity method investments 3,533 373 (357)    
Muskie Holdings LLC [Member]
          
Schedule of Equity Method Investments [Line Items]          
Approximate Ownership percentage 25.00%        
Equity investments 7,544 7,320      
(Income) loss from equity method investments 1,975 1,031 4    
Timber Wolf Terminals LLC [Member]
          
Schedule of Equity Method Investments [Line Items]          
Approximate Ownership percentage 50.00%        
Equity investments 1,001 878      
(Income) loss from equity method investments (6) 122 0    
Windsor Midstream LLC [Member]
          
Schedule of Equity Method Investments [Line Items]          
Approximate Ownership percentage 22.50%        
Equity investments 10,632 9,503      
(Income) loss from equity method investments (1,125) (663) 0    
Stingray Pressure Pumping LLC [Member]
          
Schedule of Equity Method Investments [Line Items]          
Approximate Ownership percentage 50.00%        
Equity investments 19,624 13,265      
(Income) loss from equity method investments (818) 1,235 0    
Stingray Cementing LLC [Member]
          
Schedule of Equity Method Investments [Line Items]          
Approximate Ownership percentage 50.00%        
Equity investments 3,291 3,110      
(Income) loss from equity method investments 93 159 0    
Blackhawk Midstream LLC [Member]
          
Schedule of Equity Method Investments [Line Items]          
Approximate Ownership percentage 50.00%        
Equity investments 0 0      
(Income) loss from equity method investments 673 436 0    
Stingray Logistics LLC [Member]
          
Schedule of Equity Method Investments [Line Items]          
Approximate Ownership percentage 50.00%        
Equity investments 903 947      
(Income) loss from equity method investments 51 36 0    
Diamondback Energy, Inc [Member]
          
Schedule of Equity Method Investments [Line Items]          
Approximate Ownership percentage 7.20% 21.40%      
Diamondback Energy LLC [Member]
          
Schedule of Equity Method Investments [Line Items]          
Approximate Ownership percentage 7.20%       21.40%
Equity investments 178,708 151,317   138,500  
(Income) loss from equity method investments (220,129) (12,821) 0    
Stingray Energy Services LLC [Member]
          
Schedule of Equity Method Investments [Line Items]          
Approximate Ownership percentage 50.00%        
Equity investments 3,800 0      
(Income) loss from equity method investments $ (215) $ 0 $ 0