Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Disaggregated Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 829,691
Lease bonus - mineral acreage	2,489	$ 0	$ 0
Realized gain on derivatives	2,334	(4,321)	9,286
Unrealized gain on derivatives	65,085	9,715	(41,238)
Total revenues	899,599	544,276	264,422
Oil
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	635,554
Natural gas revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	165,146
Third-party midstream services revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	21,920	10,198	5,218
Sales of purchased natural gas
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 7,071	$ 0	$ 0

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The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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