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Earnings per Share - Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Diluted earnings per share:
Net income (loss) available for common stockholders, net of dividends and undistributed earnings allocated to participating securities	$ (7,114)	$ 171,538
Weighted average shares of common stock outstanding:
Issued and outstanding (in shares)	107,319,812	90,699,321
Weighted average shares of common stock outstanding (in shares)	107,319,812	92,406,318
Diluted earnings per share (in dollars per share)	$ (0.07)	$ 1.86
Stock options
Weighted average shares of common stock outstanding:
Dilutive impact excluded from computation of earnings per share	864,601
RSUs
Weighted average shares of common stock outstanding:
Dilutive impact excluded from computation of earnings per share	168,221
Class A
Weighted average shares of common stock outstanding:
Issued and outstanding (in shares)	107,319,812	90,699,321
Issuable pursuant to 2015 Management Incentive Plan (in shares)	0	1,706,996
Weighted average shares of common stock outstanding (in shares)	107,319,812	92,406,317

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