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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net Income	$ 20,390	$ 17,871	$ 59,053	$ 42,139
Weighted-average number of basic shares outstanding during the period	18,865	18,853	18,864	18,841
Dilutive effect of stock options, RSUs, and performance shares	196	233	213	270
Weighted-average number of diluted shares outstanding during the period	19,061	19,086	19,077	19,111
Basic earnings per share	$ 1.08	$ 0.95	$ 3.13	$ 2.24
Diluted earnings per share	$ 1.07	$ 0.94	$ 3.10	$ 2.20