Quarterly report pursuant to Section 13 or 15(d)

Equity Investments (Narrative) (Details)

v3.3.0.814
Equity Investments (Narrative) (Details)
a in Thousands, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Nov. 12, 2014
USD ($)
shares
Jan. 28, 2014
USD ($)
Mar. 31, 2015
USD ($)
Sep. 30, 2014
USD ($)
shares
Jun. 30, 2014
shares
Sep. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Sep. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Sep. 30, 2015
USD ($)
a
shares
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
shares
Dec. 31, 2012
Oct. 11, 2012
USD ($)
shares
Schedule of Equity Method Investments [Line Items]                              
Distributions received                   $ 4,761 $ 476        
Equity investments and investments in subsidiaries           $ 295,103       295,103   $ 369,581      
(Income) loss from equity method investments           $ 61,891   $ 34,477   57,036 (163,567)        
Payments for equity method investments                   $ 13,837 61,750        
Apico Llc [Member]                              
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          
Tatex Thailand III, LLC [Member]                              
Schedule of Equity Method Investments [Line Items]                              
Gas and oil area, reserve (acres) | a                   245          
Ownership interest           17.90%       17.90%          
Equity investments and investments in subsidiaries           $ 0       $ 0          
(Income) loss from equity method investments           0   47   $ 0 217        
Grizzly Oil Sands ULC [Member]                              
Schedule of Equity Method Investments [Line Items]                              
Gas and oil area, reserve (acres) | a                   830          
Unrealized gain investments                   $ 58,000          
Cash calls paid                   13,800          
Increase (decrease) due to foreign currency translation adjustment           $ (11,600)   (9,500)   $ (23,300) (10,000)        
Ownership interest           24.9999%       24.9999%          
Equity investments and investments in subsidiaries                       180,218      
(Income) loss from equity method investments           $ 58,653   4,633   $ 71,289 8,862        
Windsor Midstream LLC [Member]                              
Schedule of Equity Method Investments [Line Items]                              
Ownership interest           22.50%       22.50%          
Distributions received                   $ 3,800          
Equity investments and investments in subsidiaries           $ 27,940       27,940   13,505      
(Income) loss from equity method investments           $ (323)   (301)   $ (18,229) (504)        
Windsor Midstream LLC [Member] | MidMar Gas LLC [Member]                              
Schedule of Equity Method Investments [Line Items]                              
Ownership interest                           28.40%  
Coronado Midstream [Member] | Windsor Midstream LLC [Member]                              
Schedule of Equity Method Investments [Line Items]                              
Proceeds from sale of interest in partnership unit     $ 600,000                        
Gain on sale on investment     $ 81,600                        
Blackhawk Midstream LLC [Member]                              
Schedule of Equity Method Investments [Line Items]                              
Ownership interest           48.50%       48.50%          
Equity investments and investments in subsidiaries           $ 0       $ 0   0      
(Income) loss from equity method investments           $ 0   0   $ (7,217) (84,787)        
Blackhawk Midstream LLC [Member] | Ohio Gathering Company, LLC and Ohio Condensate Company, LLC [Member]                              
Schedule of Equity Method Investments [Line Items]                              
Purchase price of sold equity interests   $ 190,000                          
Amount put in escrow   $ 14,300                          
Distributions received                 $ 84,800            
Proceeds from release of escrow deposits             $ 7,200                
Diamondback Energy, Inc [Member]                              
Schedule of Equity Method Investments [Line Items]                              
Ownership interest           0.00%       0.00%          
Investment (shares) | shares                             7,914,036
Equity investments and investments in subsidiaries           $ 0       $ 0   $ 0     $ 138,500
Number of shares issued in transaction (shares) | shares 942,000     1,437,500 1,000,000               4,534,536    
Proceeds received from sale of stock $ 60,800     $ 197,600                 $ 192,700    
(Income) loss from equity method investments           $ 0   32,412   $ 0 (89,300)        
Sturgeon Acquisitions LLC [Member]                              
Schedule of Equity Method Investments [Line Items]                              
Ownership interest           25.00%       25.00%   25.00%      
Distributions received                   $ 1,000          
Equity investments and investments in subsidiaries           $ 22,857       22,857   $ 22,507      
(Income) loss from equity method investments           $ (257)   0   $ (1,316) 0        
Payments for equity method investments                       $ 20,700      
Mammoth Energy Partners LP [Member]                              
Schedule of Equity Method Investments [Line Items]                              
Ownership interest           30.50%       30.50%   30.50%      
Equity investments and investments in subsidiaries           $ 135,971       $ 135,971   $ 143,973      
(Income) loss from equity method investments           $ 3,612   $ 0   $ 11,608 $ 0        
Equity investment in Mammoth Energy Partners                       $ 143,500