Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Basic
Net income	$ 41,375	$ 38,527	$ 28,392	$ 118,620	$ 83,697
Less: Earnings allocated to participating securities	(432)	(444)	0	(1,223)	0
Net income allocated to common stockholders	$ 40,943	$ 38,083	$ 28,392	$ 117,397	$ 83,697
Weighted average common shares outstanding (in shares)	59,293,218	61,308,046	61,727,030	60,853,081	51,282,533
Basic earnings per common share (in dollars per share)	$ 0.69	$ 0.62	$ 0.46	$ 1.93	$ 1.63
Diluted
Net income allocated to common stockholders	$ 40,943	$ 38,083	$ 28,392	$ 117,397	$ 83,697
Weighted average common shares outstanding (in shares)	59,293,218	61,308,046	61,727,030	60,853,081	51,282,533
Diluted effect of share-based compensation (in shares)	377,637	353,727	634,774	348,777	683,114
Weighted average diluted common shares (in shares)	59,670,855	61,661,773	62,361,804	61,201,858	51,965,647
Diluted earnings per common share (in dollars per share)	$ 0.69	$ 0.62	$ 0.46	$ 1.92	$ 1.61
Anti-Dilutive RSUs
Diluted
Weighted-average shares of anti-dilutive RSUs excluded from diluted EPS computation	0			0