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Common Stock - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands			12 Months Ended
	Feb. 14, 2018	Nov. 13, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Proceeds from sale of common stock		$ 302,600	$ 0	$ 302,191	$ 766,670
Common Stock
Class of Stock [Line Items]
Issuance of common stock (shares)		32,000,000
Shares issued, price per share (in usd per share)		$ 9.55
Common Stock
Class of Stock [Line Items]
Issuance of common stock (shares)				32,000,000	94,300,000
Proceeds from sale of common stock		$ 300
Stock issued to fund portion of acquisition			46,000,000
Additional Paid-in-Capital
Class of Stock [Line Items]
Proceeds from sale of common stock		$ 302,300
Permian Basin Acquisition
Class of Stock [Line Items]
Shares issued as consideration (shares)	46,000,000

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