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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenues and other	$ 141,661	$ 131,862
Gains (losses) on oil derivatives	(63,124)	(34,644)
Other revenues	117	66
Total revenues and other	76,539	97,284
Oil sales
Disaggregation of Revenue [Line Items]
Revenues and other	123,450	117,902
Natural gas sales
Disaggregation of Revenue [Line Items]
Revenues and other	6,715	6,563
Gains (losses) on oil derivatives	2,115	0
Natural gas liquids sales
Disaggregation of Revenue [Line Items]
Revenues and other	937	1,159
Electricity sales
Disaggregation of Revenue [Line Items]
Revenues and other	9,729	5,453
Marketing revenues
Disaggregation of Revenue [Line Items]
Revenues and other	830	785
Oil
Disaggregation of Revenue [Line Items]
Gains (losses) on oil derivatives	$ (65,239)	$ (34,644)

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