Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Basic
Net income	$ 38,718	$ 39,643	$ 28,002
Less: Earnings allocated to participating securities	(347)	0	0
Net income allocated to common stockholders	$ 38,371	$ 39,643	$ 28,002
Weighted average common shares outstanding (in shares)	61,987,605	61,917,184	45,893,496
Basic earnings per share (in dollars per share)	$ 0.62	$ 0.64	$ 0.61
Diluted
Net income allocated to common stockholders	$ 38,371	$ 39,643	$ 28,002
Weighted average common shares outstanding (in shares)	61,987,605	61,917,184	45,893,496
Diluted effect of share-based compensation (in shares)	298,178	539,916	758,563
Weighted average diluted common shares (in shares)	62,285,783	62,457,100	46,652,059
Diluted earnings per share (in dollars per share)	$ 0.62	$ 0.63	$ 0.60