Equity and Earnings Per Common Share - Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity and Earnings Per Common Share
Net income (loss)	$ (144,559)	$ (289,477)	$ 69,274	$ 9,648	$ 21,388	$ 18,028	$ 14,387	$ 12,805	$ (355,114)	$ 66,608	$ 2,325
Pre-IPO net income attributed to parent											4,939
Less net income attributable to Series B Units					$ (3,719)	$ (598)	$ (506)	$ (413)		(5,236)	(784)
Less preferred stock dividends									(442)
Net income (loss) available to common shareholders									$ (355,556)	$ 61,372	$ 6,480
Net income (loss) per share-basic and diluted	$ (0.29)	$ (0.57)	$ 0.14	$ 0.04	$ 0.10	$ 0.09	$ 0.07	$ 0.07	$ (0.80)	$ 0.33	$ 0.03
Basic weighted average number of shares outstanding									442,640	186,203	186,176
Weighted average common shares outstanding-diluted									442,640	186,203	186,176