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Disaggregation of oil, gas, and NGL production revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Segment Reporting Information [Line Items]    
Revenue from Contract with Customer, Including Assessed Tax [1] $ 340,476 $ 382,886
Relative percentage [1] 100.00% 100.00%
Revenue, Remaining Performance Obligation, Amount $ 0  
Permian [Member]    
Segment Reporting Information [Line Items]    
Revenue from Contract with Customer, Including Assessed Tax [1] 240,860 $ 230,794
South Texas & Gulf Coast [Member]    
Segment Reporting Information [Line Items]    
Revenue from Contract with Customer, Including Assessed Tax [1] 99,616 114,086
Rocky Mountain [Member]    
Segment Reporting Information [Line Items]    
Revenue from Contract with Customer, Including Assessed Tax [1] $ 0 $ 38,006
Sales Revenue, Net [Member] | Geographic Concentration Risk [Member] | Permian [Member]    
Segment Reporting Information [Line Items]    
Relative percentage [1] 71.00% 60.00%
Sales Revenue, Net [Member] | Geographic Concentration Risk [Member] | South Texas & Gulf Coast [Member]    
Segment Reporting Information [Line Items]    
Relative percentage [1] 29.00% 30.00%
Sales Revenue, Net [Member] | Geographic Concentration Risk [Member] | Rocky Mountain [Member]    
Segment Reporting Information [Line Items]    
Relative percentage [1] 0.00% 10.00%
Oil production revenue [Member]    
Segment Reporting Information [Line Items]    
Revenue from Contract with Customer, Including Assessed Tax [1] $ 239,061 $ 261,060
Oil production revenue [Member] | Permian [Member]    
Segment Reporting Information [Line Items]    
Revenue from Contract with Customer, Including Assessed Tax 225,247 205,794
Oil production revenue [Member] | South Texas & Gulf Coast [Member]    
Segment Reporting Information [Line Items]    
Revenue from Contract with Customer, Including Assessed Tax 13,814 19,583
Oil production revenue [Member] | Rocky Mountain [Member]    
Segment Reporting Information [Line Items]    
Revenue from Contract with Customer, Including Assessed Tax 0 35,683
Gas production revenue [Member]    
Segment Reporting Information [Line Items]    
Revenue from Contract with Customer, Including Assessed Tax [1] 65,113 79,109
Gas production revenue [Member] | Permian [Member]    
Segment Reporting Information [Line Items]    
Revenue from Contract with Customer, Including Assessed Tax 15,592 24,876
Gas production revenue [Member] | South Texas & Gulf Coast [Member]    
Segment Reporting Information [Line Items]    
Revenue from Contract with Customer, Including Assessed Tax 49,521 52,733
Gas production revenue [Member] | Rocky Mountain [Member]    
Segment Reporting Information [Line Items]    
Revenue from Contract with Customer, Including Assessed Tax 0 1,500
NGL production revenue [Member]    
Segment Reporting Information [Line Items]    
Revenue from Contract with Customer, Including Assessed Tax [1] 36,302 42,717
NGL production revenue [Member] | Permian [Member]    
Segment Reporting Information [Line Items]    
Revenue from Contract with Customer, Including Assessed Tax 21 124
NGL production revenue [Member] | South Texas & Gulf Coast [Member]    
Segment Reporting Information [Line Items]    
Revenue from Contract with Customer, Including Assessed Tax 36,281 41,770
NGL production revenue [Member] | Rocky Mountain [Member]    
Segment Reporting Information [Line Items]    
Revenue from Contract with Customer, Including Assessed Tax $ 0 $ 823
[1] Note: Amounts may not calculate due to rounding.