Earnings Per Share - Schedule of Dilutive Effect of Stock Options RSUs and PSAs (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net Income	$ 19,630	$ 16,671	$ 49,559	$ 42,705
Weighted-average number of basic shares outstanding during the period	18,799	18,873	18,810	18,783
Dilutive effect of stock options, RSUs, and performance shares	370	433	398	473
Weighted-average number of diluted shares outstanding during the period	19,169	19,306	19,208	19,256
Basic earnings per share	$ 1.04	$ 0.88	$ 2.63	$ 2.27
Diluted earnings per share	$ 1.02	$ 0.86	$ 2.58	$ 2.22