Earnings Per Share - Schedule of Computation of Basic and Diluted Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share
Net income	$ 18,922	$ 8,464
Less: income allocated to participating securities	(18)	(13)
Income allocated to common shareholders	$ 18,904	$ 8,451
Weighted average shares outstanding for basic earnings per common share	30,961,187	30,493,689
Dilutive effect of equity awards	536,351	649,839
Weighted average shares outstanding for diluted earnings per common share	31,497,538	31,143,528
Basic earnings per share (in dollars per share)	$ 0.61	$ 0.28
Diluted earnings per share (in dollars per share)	$ 0.60	$ 0.27