Earnings Per Share - Schedule of Earnings Per Share, Basic and Diluted (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	$ 5,526	$ 7,576	$ 14,697	$ 15,130	$ 13,102	$ 29,827
Basic earnings per share - weighted average shares outstanding	31,126		31,859		31,058	31,760
Employee stock options and restricted stock units - dilutive shares	272		578		311	617
Diluted earnings per share - weighted average shares outstanding	31,398		32,437		31,369	32,377
Basic	$ 0.18		$ 0.46		$ 0.42	$ 0.94
Diluted	$ 0.18		$ 0.45		$ 0.42	$ 0.92