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Revenue Recognition - Disaggregated Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Exploration and Production [Member]    
Disaggregation of Revenue [Line Items]    
Total revenues $ 381,708 $ 264,884
Exploration and Production [Member] | Oil Production [Member]    
Disaggregation of Revenue [Line Items]    
Total revenues 323,386 208,595
Exploration and Production [Member] | Purchased Oil Sales [Member]    
Disaggregation of Revenue [Line Items]    
Total revenues 17,989 27,630
Exploration and Production [Member] | Natural Gas Production [Member]    
Disaggregation of Revenue [Line Items]    
Total revenues 26,961 19,535
Exploration and Production [Member] | Purchased Gas Sales [Member]    
Disaggregation of Revenue [Line Items]    
Total revenues 49 0
Exploration and Production [Member] | Natural Gas Liquid Services [Member]    
Disaggregation of Revenue [Line Items]    
Total revenues 13,323 9,124
Midstream Services [Member]    
Disaggregation of Revenue [Line Items]    
Total revenues 27,922 14,606
Midstream Services [Member] | Crude Oil and Natural Gas Services [Member]    
Disaggregation of Revenue [Line Items]    
Total revenues 18,029 8,551
Midstream Services [Member] | Water Services [Member]    
Disaggregation of Revenue [Line Items]    
Total revenues 9,893 6,055
Well Services [Member]    
Disaggregation of Revenue [Line Items]    
Total revenues 11,586 5,627
Well Services [Member] | Hydraulic Fracturing Services [Member]    
Disaggregation of Revenue [Line Items]    
Total revenues 10,426 5,156
Well Services [Member] | Equipment Rental Services [Member]    
Disaggregation of Revenue [Line Items]    
Total revenues $ 1,160 $ 471