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Revenue Recognition - Revenue by product type (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Revenue from External Customer [Line Items]    
Revenues $ 37,009 $ 40,741
Oil sales    
Revenue from External Customer [Line Items]    
Revenues 29,990 33,584
Natural gas liquid sales    
Revenue from External Customer [Line Items]    
Revenues 2,599 3,393
Natural gas sales    
Revenue from External Customer [Line Items]    
Revenues $ 4,420 $ 3,764