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Business Segment Information - Summarized Financial Information of Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Segment Reporting Information [Line Items]          
Total revenues $ 254,091 $ 179,080 $ 539,207 $ 309,363  
Operating income (loss) 5,379 (28,214) 25,471 (103,429)  
Other income (expense) 13,528 (114,215) 33,298 (131,084)  
Income (loss) before income taxes 18,907 (142,429) 58,769 (234,513)  
Property, plant and equipment, net 5,931,014   5,931,014   $ 5,919,567
Total assets 6,261,721   6,261,721   6,178,632
Exploration and Production [Member]          
Segment Reporting Information [Line Items]          
Total revenues 226,724 159,337 491,607 276,652  
Midstream Services [Member]          
Segment Reporting Information [Line Items]          
Total revenues 40,312 28,935 77,953 58,753  
Well Services [Member]          
Segment Reporting Information [Line Items]          
Total revenues 33,451 21,135 54,431 52,023  
Operating Segments [Member] | Exploration and Production [Member]          
Segment Reporting Information [Line Items]          
Total revenues 226,724 159,337 491,607 276,652  
Operating income (loss) (17,425) (44,748) (16,456) (133,625)  
Other income (expense) 13,525 (114,230) 33,292 (131,119)  
Income (loss) before income taxes (3,900) (158,978) 16,836 (264,744)  
Property, plant and equipment, net 5,567,347   5,567,347   5,620,558
Total assets 5,881,351   5,881,351   5,868,747
Operating Segments [Member] | Midstream Services [Member]          
Segment Reporting Information [Line Items]          
Total revenues 15,566 6,910 30,172 13,893  
Operating income (loss) 23,103 18,056 43,865 33,200  
Other income (expense) 3 (16) 2 (2)  
Income (loss) before income taxes 23,106 18,040 43,867 33,198  
Property, plant and equipment, net 495,112   495,112   424,197
Total assets 504,119   504,119   431,095
Operating Segments [Member] | Well Services [Member]          
Segment Reporting Information [Line Items]          
Total revenues 11,801 12,833 17,428 18,818  
Operating income (loss) 1,950 (2,173) (1,641) 1,848  
Other income (expense) 0 31 4 37  
Income (loss) before income taxes 1,950 (2,142) (1,637) 1,885  
Property, plant and equipment, net 41,228   41,228   47,189
Total assets 48,924   48,924   51,167
Segment Reconciling Items [Member] | Exploration and Production [Member]          
Segment Reporting Information [Line Items]          
Total revenues 0 0 0 0  
Segment Reconciling Items [Member] | Midstream Services [Member]          
Segment Reporting Information [Line Items]          
Total revenues 24,746 22,025 47,781 44,860  
Segment Reconciling Items [Member] | Well Services [Member]          
Segment Reporting Information [Line Items]          
Total revenues 21,650 8,302 37,003 33,205  
Intersegment Eliminations [Member]          
Segment Reporting Information [Line Items]          
Total revenues (46,396) (30,327) (84,784) (78,065)  
Operating income (loss) (2,249) 651 (297) (4,852)  
Other income (expense) 0 0 0 0  
Income (loss) before income taxes (2,249) $ 651 (297) $ (4,852)  
Property, plant and equipment, net (172,673)   (172,673)   (172,377)
Total assets $ (172,673)   $ (172,673)   $ (172,377)