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Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Disaggregated 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 [Line Items]
Revenues from contracts with customers	$ 223,091		$ 620,539
Realized gain (loss) on derivatives	5,424	$ 485	(1,322)	$ (1,176)
Unrealized (loss) gain on derivatives	(21,337)	(12,372)	(9,492)	21,449
Total revenue	207,178	$ 126,279	609,725	$ 390,703
Oil revenues
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	169,913		484,343
Natural gas revenues
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	46,369		122,912
Third-party midstream services revenues
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	6,809		13,284
Total revenues from contracts with customers
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	223,091		620,539
Calculated under Revenue Guidance in Effect before Topic 606 [Member] \| Accounting Standards Update 2014-09 [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	2,800		7,600
Cost of Goods and Services Sold	$ (2,800)		$ (7,600)