Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Basic
Net income	$ 38,527	$ 38,718	$ 27,303	$ 77,245	$ 55,305
Less: Earnings allocated to participating securities	(444)	(347)	0	(791)	0
Net income allocated to common stockholders	$ 38,083	$ 38,371	$ 27,303	$ 76,454	$ 55,305
Weighted average common shares outstanding (in shares)	61,308,046	61,987,605	46,053,077	61,645,940	45,973,727
Basic earnings per share (in dollars per share)	$ 0.62	$ 0.62	$ 0.59	$ 1.24	$ 1.20
Diluted
Net income allocated to common stockholders	$ 38,083	$ 38,371	$ 27,303	$ 76,454	$ 55,305
Weighted average common shares outstanding (in shares)	61,308,046	61,987,605	46,053,077	61,645,940	45,973,727
Diluted effect of share-based compensation (in shares)	353,727	298,178	649,891	334,193	704,396
Weighted average diluted common shares (in shares)	61,661,773	62,285,783	46,702,968	61,980,133	46,678,123
Diluted earnings per share (in dollars per share)	$ 0.62	$ 0.62	$ 0.58	$ 1.23	$ 1.18
Anti-Dilutive RSUs
Diluted
Weighted-average shares of anti-dilutive RSUs excluded from diluted EPS computation	0			0