Quarterly report pursuant to Section 13 or 15(d)

Equity Investments (Narrative) (Details)

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Equity Investments (Narrative) (Details)
a in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 28, 2014
USD ($)
Mar. 31, 2015
USD ($)
Mar. 31, 2016
USD ($)
a
shares
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2012
Oct. 05, 2012
USD ($)
Schedule of Equity Method Investments [Line Items]              
Income (Loss) from Equity Method Investments     $ (30,737,000) $ 19,975,000      
Distributions from equity method investments     138,000 817,000      
Payments for equity method investments     $ 1,821,000 6,093,000      
Investment in Tatex Thailand II, LLC              
Schedule of Equity Method Investments [Line Items]              
Equity shares owned by affiliate (shares) | shares     85,122        
Total shares owned of subaffiliate (shares) | shares     1,000,000        
Gas and oil area, reserve (acres) | a     243        
Income (Loss) from Equity Method Investments     $ 159,000 0      
Ownership interest     23.50%        
Investment in Tatex Thailand III, LLC              
Schedule of Equity Method Investments [Line Items]              
Gas and oil area, reserve (acres) | a     245        
Income (Loss) from Equity Method Investments     $ 0 0      
Ownership interest     17.90%        
Investment in Grizzly Oil Sands ULC              
Schedule of Equity Method Investments [Line Items]              
Gas and oil area, reserve (acres) | a     830        
Income (Loss) from Equity Method Investments     $ (23,685,000) (4,142,000)      
Equity method investment, other than temporary impairment     23,100,000        
Equity method investment, amount of cash calls, based on proportionate ownership interest     1,800,000        
Increase (decrease) due to foreign currency translation adjustment     $ 10,300,000 (15,000,000)      
Ownership interest     24.9999%        
Equity investment     $ 39,054,000        
Investment in Timber Wolf Terminals LLC              
Schedule of Equity Method Investments [Line Items]              
Income (Loss) from Equity Method Investments     $ (3,000) (6,000)      
Ownership interest     50.00%        
Investment in Windsor Midstream LLC              
Schedule of Equity Method Investments [Line Items]              
Income (Loss) from Equity Method Investments     $ 167,000 18,787,000      
Distributions from equity method investments     $ 100,000        
Ownership interest     22.50%        
Investment in Windsor Midstream LLC | MidMar Gas LLC              
Schedule of Equity Method Investments [Line Items]              
Ownership interest           28.40%  
Coronado Midstream | Investment in Windsor Midstream LLC              
Schedule of Equity Method Investments [Line Items]              
Proceeds from sale of interest in partnership unit   $ 600,000,000          
Gain on sale on investment   $ 81,600,000          
Investment in Blackhawk Midstream LLC              
Schedule of Equity Method Investments [Line Items]              
Income (Loss) from Equity Method Investments     $ 0 7,217,000      
Ownership interest     48.50%        
Investment in Blackhawk Midstream LLC | Ohio Gathering Company, LLC and Ohio Condensate Company, LLC              
Schedule of Equity Method Investments [Line Items]              
Purchase price of sold equity interests $ 190,000,000            
Amount put in escrow $ 14,300,000            
Proceeds from release of escrow deposits       7,200,000      
Investment in Stingray Energy Services LLC              
Schedule of Equity Method Investments [Line Items]              
Income (Loss) from Equity Method Investments     $ (502,000) (10,000)      
Ownership interest     50.00%        
Investment in Sturgeon Acquisitions LLC              
Schedule of Equity Method Investments [Line Items]              
Income (Loss) from Equity Method Investments     $ (377,000) 568,000      
Ownership interest     25.00%        
Payments for equity method investments         $ 20,700,000    
Investment in Mammoth Energy Partners LP              
Schedule of Equity Method Investments [Line Items]              
Income (Loss) from Equity Method Investments     $ (6,466,000) (2,372,000)      
Increase (decrease) due to foreign currency translation adjustment     $ (1,200,000)        
Ownership interest     30.50%   30.50%    
Investment in Strike Force Midstream LLC              
Schedule of Equity Method Investments [Line Items]              
Income (Loss) from Equity Method Investments     $ 0 $ 0      
Ownership interest     25.00%        
Equity investment     $ 22,500,000        
Investment in Strike Force Midstream LLC | Rice Energy Inc              
Schedule of Equity Method Investments [Line Items]              
Ownership interest     75.00%        
Revolving Credit Facility              
Schedule of Equity Method Investments [Line Items]              
Credit facility outstanding     $ 14,300,000        
Revolving Credit Facility | Subsidiaries              
Schedule of Equity Method Investments [Line Items]              
Revolving credit facility             $ 125,000,000.0
Credit facility outstanding     $ 57,200,000