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Business Segment Information - Summarized Financial Information of Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Segment Reporting Information [Line Items]      
Total revenues $ 421,216 $ 285,116  
Operating income 112,985 20,092  
Other income (expense) (108,445) 19,770  
Income before income taxes 4,540 39,862  
Property, plant and equipment, net 7,186,606   $ 6,173,486
Total assets 7,638,930   6,615,130
Exploration and Production [Member]      
Segment Reporting Information [Line Items]      
Total revenues 381,708 264,883  
Midstream Services [Member]      
Segment Reporting Information [Line Items]      
Total revenues 64,562 37,641  
Well Services [Member]      
Segment Reporting Information [Line Items]      
Total revenues 44,888 20,979  
Operating Segments [Member] | Exploration and Production [Member]      
Segment Reporting Information [Line Items]      
Total revenues 381,708 264,883  
Operating income 79,962 968  
Other income (expense) (108,146) 19,768  
Income before income taxes (28,184) 20,736  
Property, plant and equipment, net 6,600,397   5,663,323
Total assets 6,994,927   6,050,255
Operating Segments [Member] | Midstream Services [Member]      
Segment Reporting Information [Line Items]      
Total revenues 27,922 14,606  
Operating income 32,237 20,763  
Other income (expense) (258) (2)  
Income before income taxes 31,979 20,761  
Property, plant and equipment, net 732,801   649,923
Total assets 752,301   663,614
Operating Segments [Member] | Well Services [Member]      
Segment Reporting Information [Line Items]      
Total revenues 11,586 5,627  
Operating income 8,148 (3,592)  
Other income (expense) (41) 4  
Income before income taxes 8,107 (3,588)  
Property, plant and equipment, net 47,310   46,779
Total assets 50,605   52,800
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 36,640 23,035  
Segment Reconciling Items [Member] | Well Services [Member]      
Segment Reporting Information [Line Items]      
Total revenues 33,302 15,352  
Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Total revenues (69,942) (38,387)  
Operating income (7,362) 1,953  
Other income (expense) 0 0  
Income before income taxes (7,362) $ 1,953  
Property, plant and equipment, net (193,902)   (186,539)
Total assets $ (158,903)   $ (151,539)