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Revenues - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disaggregation of Revenue [Line Items]    
Revenues $ 87,128 $ 98,350
Oil    
Disaggregation of Revenue [Line Items]    
Revenues 53,335 55,782
NGL    
Disaggregation of Revenue [Line Items]    
Revenues 16,389 14,433
Natural gas    
Disaggregation of Revenue [Line Items]    
Revenues 17,242 27,934
Other    
Disaggregation of Revenue [Line Items]    
Revenues $ 162 $ 201