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
Beginning of period at Dec. 31, 2020	$ 179,935	$ 726	$ 472,378	$ (4,423)	$ 388,645	$ (677,391)
Beginning of period (in shares) at Dec. 31, 2020						50,427
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
End of period at Mar. 31, 2021	176,656	$ 726	476,165	(3,437)	396,849	$ (693,647)
End of period (in shares) at Mar. 31, 2021						50,740
Beginning balance (in shares) at Dec. 31, 2020		72,600
Beginning of period at Dec. 31, 2020	179,935	$ 726	472,378	(4,423)	388,645	$ (677,391)
Beginning of period (in shares) at Dec. 31, 2020						50,427
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	54,617
Employee stock purchase plan	558
Defined benefit pension plan, no tax benefit	3,103
Change in fair value of interest rate swaps	1,101
Ending balance (in shares) at Sep. 30, 2021		72,640
End of period at Sep. 30, 2021	189,969	$ 726	484,034	(219)	427,622	$ (722,194)
End of period (in shares) at Sep. 30, 2021						51,207
Beginning balance (in shares) at Mar. 31, 2021		72,615
Beginning of period at Mar. 31, 2021	176,656	$ 726	476,165	(3,437)	396,849	$ (693,647)
Beginning of period (in shares) at Mar. 31, 2021						50,740
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
End of period at Jun. 30, 2021	186,279	$ 727	480,114	(371)	413,018	$ (707,209)
End of period (in shares) at Jun. 30, 2021						50,961
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	20,168				20,168
Issuance for stock-based compensation and dividends, net of forfeitures (in shares)		(15)
Issuance for stock-based compensation and dividends, net of forfeitures	(1)	$ (1)	260		(260)
Stock-based compensation expense	3,512		3,512
Employee stock purchase plan (in shares)						(3)
Employee stock purchase plan	193		148			$ 45
Dividends	(5,304)				(5,304)
Defined benefit pension plan, no tax benefit	0
Change in fair value of interest rate swaps	152			152
Repurchases of common stock (in shares)						249
Repurchases of common stock	(15,030)					$ (15,030)
Ending balance (in shares) at Sep. 30, 2021		72,640
End of period at Sep. 30, 2021	189,969	$ 726	484,034	(219)	427,622	$ (722,194)
End of period (in shares) at Sep. 30, 2021						51,207
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	$ 68,359
Employee stock purchase plan	831
Defined benefit pension plan, no tax benefit	0
Change in fair value of interest rate swaps	(615)
Ending balance (in shares) at Sep. 30, 2022		73,006
End of period at Sep. 30, 2022	$ 208,976	$ 730	502,909	6	491,856	$ (786,525)
End of period (in shares) at Sep. 30, 2022	52,172					52,172
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)
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	22,262				22,262
Issuance for stock-based compensation and dividends, net of forfeitures (in shares)		(1)
Issuance for stock-based compensation and dividends, net of forfeitures	(1)		318		(319)
Stock-based compensation expense	4,445		4,445
Employee stock purchase plan (in shares)						(5)
Employee stock purchase plan	294		219			$ 75
Dividends	(5,977)				(5,977)
Defined benefit pension plan, no tax benefit	0
Repurchases of common stock (in shares)						383
Repurchases of common stock	(22,580)					$ (22,580)
Ending balance (in shares) at Sep. 30, 2022		73,006
End of period at Sep. 30, 2022	$ 208,976	$ 730	$ 502,909	$ 6	$ 491,856	$ (786,525)
End of period (in shares) at Sep. 30, 2022	52,172					52,172