Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Basic
Net (loss) income	$ (99,091)	$ 25,740	$ 38,527	$ (73,351)	$ 77,245
Less: Dividends and undistributed earnings allocated to participating securities	(222)	(232)	(444)	(356)	(791)
Net (loss) income allocated to common stockholders	$ (99,313)	$ 25,508	$ 38,083	$ (73,707)	$ 76,454
Weighted average common shares outstanding (in shares)	70,425,027	59,007,191	61,308,046	64,716,109	61,645,940
Basic earnings per common share (in dollars per share)	$ (1.41)	$ 0.43	$ 0.62	$ (1.14)	$ 1.24
Diluted
Net (loss) income allocated to common stockholders	$ (99,313)	$ 25,508	$ 38,083	$ (73,707)	$ 76,454
Weighted average common shares outstanding (in shares)	70,425,027	59,007,191	61,308,046	64,716,109	61,645,940
Diluted effect of share-based compensation (in shares)	0	182,526	353,727	0	334,193
Diluted effect of stock warrants (in shares)	0	0	0	0	0
Weighted average diluted common shares (in shares)	70,425,027	59,189,717	61,661,773	64,716,109	61,980,133
Diluted earnings per common share (in dollars per share)	$ (1.41)	$ 0.43	$ 0.62	$ (1.14)	$ 1.23
Weighted-average shares of anti-dilutive RSUs excluded from diluted EPS computation	234,518			163,832