Net Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income	$ 9,949	$ 8,211
Basic weighted-average common shares outstanding (in shares)	38,603	37,886
Effect of dilutive stock options (in shares)	58	150
Effect of dilutive restricted stock (in shares)	1,126	1,457
Diluted weighted-average common shares outstanding (in shares)	39,787	39,493
Basic income per common share (in dollars per share)	$ 0.26	$ 0.22
Diluted income per common share (in dollars per share)	$ 0.25	$ 0.21
Antidilutive securities excluded from diluted net income per common share (in shares)	222	86