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 (Loss) Income	Retained Earnings	Treasury Stock
Beginning balance (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)
Ending balance (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)
Beginning balance (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	34,449
Employee stock purchase plan	365
Defined benefit pension plan, no tax benefit	3,103
Change in fair value of interest rate swaps	949
Ending balance (in shares) at Jun. 30, 2021		72,655				50,961
End of period at Jun. 30, 2021	186,279	$ 727	480,114	(371)	413,018	$ (707,209)
Beginning balance (in shares) at Mar. 31, 2021		72,615				50,740
Beginning of period at Mar. 31, 2021	176,656	$ 726	476,165	(3,437)	396,849	$ (693,647)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	21,188				21,188
Issuance for stock-based compensation and dividends, net of forfeitures (in shares)		40
Issuance for stock-based compensation and dividends, net of forfeitures	2	$ 1	274		(273)
Stock-based compensation expense	3,532		3,532
Employee stock purchase plan (in shares)						(4)
Employee stock purchase plan	195		143			$ 52
Dividends	(4,746)				(4,746)
Defined benefit pension plan, no tax benefit	3,056			3,056
Change in fair value of interest rate swaps	10			10
Repurchases of common stock (in shares)						225
Repurchases of common stock	(13,614)					$ (13,614)
Ending balance (in shares) at Jun. 30, 2021		72,655				50,961
End of period at Jun. 30, 2021	186,279	$ 727	480,114	(371)	413,018	$ (707,209)
Beginning balance (in shares) at Dec. 31, 2021		72,997
Beginning of period at Dec. 31, 2021	$ 188,406	$ 730	488,036	621	442,596	$ (743,577)
Beginning of period (in shares) at Dec. 31, 2021	51,493					51,492
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)
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)
Ending balance (in shares) at Mar. 31, 2022		72,996
End of period at Mar. 31, 2022	198,205	$ 730	492,985	2,923	455,365	$ (753,798)
End of period (in shares) at Mar. 31, 2022						51,636
Beginning balance (in shares) at Dec. 31, 2021		72,997
Beginning of period at Dec. 31, 2021	$ 188,406	$ 730	488,036	621	442,596	$ (743,577)
Beginning of period (in shares) at Dec. 31, 2021	51,493					51,492
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 46,097
Employee stock purchase plan	537
Defined benefit pension plan, no tax benefit	0
Change in fair value of interest rate swaps	(615)
Ending balance (in shares) at Jun. 30, 2022		73,007
End of period at Jun. 30, 2022	$ 210,533	$ 730	497,927	6	475,890	$ (764,020)
End of period (in shares) at Jun. 30, 2022	51,794					51,794
Beginning balance (in shares) at Mar. 31, 2022		72,996
Beginning of period at Mar. 31, 2022	$ 198,205	$ 730	492,985	2,923	455,365	$ (753,798)
Beginning of period (in shares) at Mar. 31, 2022						51,636
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	26,916				26,916
Issuance for stock-based compensation and dividends, net of forfeitures (in shares)		11
Issuance for stock-based compensation and dividends, net of forfeitures	0		298		(298)
Stock-based compensation expense	4,410		4,410
Employee stock purchase plan (in shares)						(4)
Employee stock purchase plan	295		234			$ 61
Dividends	(6,093)				(6,093)
Defined benefit pension plan, no tax benefit	0
Change in fair value of interest rate swaps	(2,917)			(2,917)
Repurchases of common stock (in shares)						162
Repurchases of common stock	(10,283)					$ (10,283)
Ending balance (in shares) at Jun. 30, 2022		73,007
End of period at Jun. 30, 2022	$ 210,533	$ 730	$ 497,927	$ 6	$ 475,890	$ (764,020)
End of period (in shares) at Jun. 30, 2022	51,794					51,794