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Revenues - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation of Revenue        
Revenues $ 97,660 $ 80,892 $ 264,250 $ 264,093
Oil        
Disaggregation of Revenue        
Revenues 63,994 44,032 166,548 147,792
NGL        
Disaggregation of Revenue        
Revenues 18,776 15,391 52,111 42,962
Natural gas        
Disaggregation of Revenue        
Revenues 14,721 21,117 45,102 72,481
Other        
Disaggregation of Revenue        
Revenues $ 169 $ 352 $ 489 $ 858