Earnings per Share - Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Diluted earnings (loss) per share:
Net income (loss) available for common stockholders, net of dividends and undistributed earnings allocated to participating securities	$ (60,521)	$ 284,023	$ 1,613
Weighted average shares of common stock outstanding:
Issued and outstanding (in shares)	113,918,103	100,875,793	62,579,147
Weighted average shares of common stock outstanding (in shares)	113,918,103	102,089,139	62,579,147
Diluted earnings (loss) per share (in dollars per share)	$ (0.53)	$ 2.78	$ 0.03
Stock options
Weighted average shares of common stock outstanding:
Dilutive impact excluded from computation of earnings per share (in shares)	377,677		1,740,630
RSUs
Weighted average shares of common stock outstanding:
Dilutive impact excluded from computation of earnings per share (in shares)	440,335
Class A
Weighted average shares of common stock outstanding:
Issued and outstanding (in shares)	113,918,103	100,875,793	62,579,147
Issuable pursuant to Amended and Restated 2015 Management Incentive Plan (in shares)	0	1,213,346	0
Weighted average shares of common stock outstanding (in shares)	113,918,103	102,089,139	62,579,147