Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Common Stock	Additional Paid-in Capital
Beginning balance at Dec. 31, 2018	$ 691,618	$ 528,027	$ (3,602)	$ 2,151	$ 165,042
Beginning balance (in shares) at Dec. 31, 2018				32,256,209
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	79,671	79,671			0
Other comprehensive (loss)	(1,962)		(1,962)		0
Dividends	(16,777)	(16,777)			0
Repurchases of common stock	(21,321)			$ (16)	(21,305)
Repurchases of common stock (in shares)				(240,995)
Shares and options issued (canceled) under stock plans	12,438			$ 13	12,425
Shares and options issued under stock plans (in shares)				186,703
Ending balance at Dec. 31, 2019	743,667	590,921	(5,564)	$ 2,148	156,162
Ending balance (in shares) at Dec. 31, 2019				32,201,917
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	84,623	84,623			0
Other comprehensive (loss)	9,737		9,737		0
Dividends	(18,804)	(18,804)			0
Repurchases of common stock	(13,463)			$ (9)	(13,454)
Repurchases of common stock (in shares)				(136,629)
Shares and options issued (canceled) under stock plans	22,473			$ 21	22,452
Shares and options issued under stock plans (in shares)				307,333
Ending balance at Dec. 31, 2020	828,233	656,740	4,173	$ 2,160	165,160
Ending balance (in shares) at Dec. 31, 2020				32,372,621
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	96,104	96,104			0
Other comprehensive (loss)	(9,166)		(9,166)		0
Dividends	(20,706)	(20,706)			0
Repurchases of common stock	(35,239)			$ (17)	(35,222)
Repurchases of common stock (in shares)				(249,848)
Shares and options issued (canceled) under stock plans	17,789			$ 11	17,778
Shares and options issued under stock plans (in shares)				164,377
Ending balance at Dec. 31, 2021	$ 877,015	$ 732,138	$ (4,993)	$ 2,154	$ 147,716
Ending balance (in shares) at Dec. 31, 2021				32,287,150