Equity - Common Stock (Details) - shares shares in Millions		1 Months Ended
	Dec. 28, 2017	Dec. 31, 2017
Austin Chalk Acreage
Class of Stock [Line Items]
Common shares issued in connection with acquisition (in shares)		2.0
10% Senior Secured Notes due 2021
Class of Stock [Line Items]
Shares issued (in shares)	2.2	2.2