UNAUDITED CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Treasury Stock
Shares at beginning of period (in shares) at Dec. 31, 2020		72,600				50,427
Beginning of period at Dec. 31, 2020	$ 179,935	$ 726	$ 472,378	$ (4,423)	$ 388,645	$ (677,391)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	13,261				13,261
Issuance for stock-based compensation and dividends, net of forfeitures (in shares)		15
Issuance for stock-based compensation and dividends, net of forfeitures	0		271		(271)
Stock-based compensation expense	3,403		3,403
Employee stock purchase plan (in shares)						(4)
Employee stock purchase plan	170		113			$ 57
Dividends	(4,786)				(4,786)
Defined benefit pension plan, no tax benefit	47			47
Change in fair value of interest rate swaps	939			939
Repurchases of common stock (in shares)						317
Repurchases of common stock	(16,313)					$ (16,313)
Shares at end of period (in shares) at Mar. 31, 2021		72,615				50,740
End of period at Mar. 31, 2021	176,656	$ 726	476,165	(3,437)	396,849	$ (693,647)
Shares at beginning of period (in shares) at Dec. 31, 2021		72,997				51,492
Beginning of period at Dec. 31, 2021	188,406	$ 730	488,036	621	442,596	$ (743,577)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	19,181				19,181
Issuance for stock-based compensation and dividends, net of forfeitures (in shares)		(1)
Issuance for stock-based compensation and dividends, net of forfeitures	1		319		(318)
Stock-based compensation expense	4,437		4,437
Employee stock purchase plan (in shares)						(3)
Employee stock purchase plan	242		193			$ 49
Dividends	(6,094)				(6,094)
Defined benefit pension plan, no tax benefit	0
Change in fair value of interest rate swaps	2,302			2,302
Repurchases of common stock (in shares)						147
Repurchases of common stock	(10,270)					$ (10,270)
Shares at end of period (in shares) at Mar. 31, 2022		72,996				51,636
End of period at Mar. 31, 2022	$ 198,205	$ 730	$ 492,985	$ 2,923	$ 455,365	$ (753,798)