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Revenues - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disaggregation of Revenue        
Revenues $ 79,462 $ 84,851 $ 166,590 $ 183,201
Oil        
Disaggregation of Revenue        
Revenues 49,219 47,978 102,554 103,760
NGL        
Disaggregation of Revenue        
Revenues 16,946 13,138 33,335 27,571
Natural gas        
Disaggregation of Revenue        
Revenues 13,139 23,430 30,381 51,364
Other        
Disaggregation of Revenue        
Revenues $ 158 $ 305 $ 320 $ 506