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Business Segment Information - Summarized Financial Information of Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Total revenues $ 285,116 $ 130,283  
Operating income (loss) 20,092 (75,215)  
Other income (expense) 19,770 (16,869)  
Income (loss) before income taxes 39,862 (92,084)  
Property, plant and equipment, net 5,896,481   $ 5,919,567
Total assets [1] 6,189,628   6,178,632
Exploration and Production [Member]      
Segment Reporting Information [Line Items]      
Total revenues 264,883 117,315  
Midstream Services [Member]      
Segment Reporting Information [Line Items]      
Total revenues 37,641 29,818  
Well Services [Member]      
Segment Reporting Information [Line Items]      
Total revenues 20,979 30,888  
Operating Segments [Member] | Exploration and Production [Member]      
Segment Reporting Information [Line Items]      
Total revenues 264,883 117,315  
Operating income (loss) 968 (88,877)  
Other income (expense) 19,768 (16,887)  
Income (loss) before income taxes 20,736 (105,764)  
Property, plant and equipment, net 5,589,014   5,620,558
Total assets [1] 5,871,573   5,868,747
Operating Segments [Member] | Midstream Services [Member]      
Segment Reporting Information [Line Items]      
Total revenues 14,606 6,983  
Operating income (loss) 20,763 15,144  
Other income (expense) (2) 13  
Income (loss) before income taxes 20,761 15,157  
Property, plant and equipment, net 433,867   424,197
Total assets [1] 440,548   431,095
Operating Segments [Member] | Well Services [Member]      
Segment Reporting Information [Line Items]      
Total revenues 5,627 5,985  
Operating income (loss) (3,592) 4,006  
Other income (expense) 4 5  
Income (loss) before income taxes (3,588) 4,011  
Property, plant and equipment, net 44,025   47,189
Total assets [1] 47,932   51,167
Segment Reconciling Items [Member] | Exploration and Production [Member]      
Segment Reporting Information [Line Items]      
Total revenues 0 0  
Segment Reconciling Items [Member] | Midstream Services [Member]      
Segment Reporting Information [Line Items]      
Total revenues 23,035 22,835  
Segment Reconciling Items [Member] | Well Services [Member]      
Segment Reporting Information [Line Items]      
Total revenues 15,352 24,903  
Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Total revenues (38,387) (47,738)  
Operating income (loss) 1,953 (5,488)  
Other income (expense) 0 0  
Income (loss) before income taxes 1,953 $ (5,488)  
Property, plant and equipment, net (170,425)   (172,377)
Total assets [1] $ (170,425)   $ (172,377)
[1] Intercompany receivables (payables) for all segments were reclassified to capital contributions from (distributions to) parent and not included in total assets.