Net Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income	$ 6,412	$ 9,949	$ 9,745	$ 8,211	$ 16,361	$ 17,956
Basic weighted-average common shares outstanding (in shares)	38,972		38,233		38,789	38,060
Effect of dilutive stock options (in shares)	98		37		80	90
Effect of dilutive restricted stock (in shares)	1,169		1,128		1,195	1,318
Diluted weighted-average common shares outstanding (in shares)	40,239		39,398		40,064	39,468
Basic income per common share (in dollars per share)	$ 0.16		$ 0.25		$ 0.42	$ 0.47
Diluted income per common share (in dollars per share)	$ 0.16		$ 0.25		$ 0.41	$ 0.45
Antidilutive securities excluded from diluted net income per common share (in shares)	31		327		55	300