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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net Income	$ 17,871	$ 19,630	$ 42,139	$ 49,559
Weighted-average number of basic shares outstanding during the period	18,853	18,799	18,841	18,810
Dilutive effect of stock options, RSUs, and performance shares	233	370	270	398
Weighted-average number of diluted shares outstanding during the period	19,086	19,169	19,111	19,208
Basic earnings per share	$ 0.95	$ 1.04	$ 2.24	$ 2.63
Diluted earnings per share	$ 0.94	$ 1.02	$ 2.20	$ 2.58