Unaudited Condensed Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Additional Paid-in Capital Cumulative effect, period of adoption, adjustment	Treasury Stock, Common	Accumulated Other Comprehensive Loss	Retained Earnings	Retained Earnings Cumulative effect, period of adoption, adjustment
Balance at Dec. 31, 2021		$ 53	$ 423,235		$ (324,412)	$ (5,843)	$ 271,732
Balance (in shares) at Dec. 31, 2021	33,881,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock compensation related to restricted stock vesting and retirement savings plan contributions		0	17,399
Issuance of stock in conjunction with acquisition including stock attributed to future compensation			3,142
Proceeds from the sales of stock through the Employee Stock Purchase Plan (in shares)	8,000
Proceeds from the sales of stock through the Employee Stock Purchase Plan			832
Stock compensation related to restricted stock vesting and retirement savings plan contributions (in shares)	246,000
Purchases of treasury stock and buyback of shares for taxes (in shares)	(236,000)
Foreign currency translation adjustment	$ (8,374)					(8,374)
Purchases of treasury stock and buyback of shares for taxes					(22,059)
Escrow Shares Reqcquired					0
Net income	77,933						77,933
Balance at Sep. 30, 2022	$ 384,270	$ 53	393,101	$ (51,507)	(346,471)	(14,217)	351,804	$ 2,139
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock in conjunction with acquisition (in shares)	49,000
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited		0
Balance (in shares) at Sep. 30, 2022	33,948,000
Balance at Jun. 30, 2022		$ 53	383,987	0	(337,237)	(8,861)	328,789	0
Balance (in shares) at Jun. 30, 2022	33,993,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock compensation related to restricted stock vesting and retirement savings plan contributions		0	5,715
Issuance of stock in conjunction with acquisition including stock attributed to future compensation			3,142
Proceeds from the sales of stock through the Employee Stock Purchase Plan (in shares)	3,000
Proceeds from the sales of stock through the Employee Stock Purchase Plan			257
Stock compensation related to restricted stock vesting and retirement savings plan contributions (in shares)	14,000
Purchases of treasury stock and buyback of shares for taxes (in shares)	(111,000)
Foreign currency translation adjustment	$ (5,356)					(5,356)
Purchases of treasury stock and buyback of shares for taxes					(9,234)
Escrow Shares Reqcquired					0
Net income	23,015						23,015
Balance at Sep. 30, 2022	$ 384,270	53	393,101	(51,507)	(346,471)	(14,217)	351,804	2,139
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock in conjunction with acquisition (in shares)	49,000
Stock Issued During Period, Shares, Escrow Shares	0
Balance (in shares) at Sep. 30, 2022	33,948,000
Balance at Dec. 31, 2022	$ 410,127	53	403,866		(354,536)	(17,519)	378,263
Balance (in shares) at Dec. 31, 2022	34,071,750
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock compensation related to restricted stock vesting and retirement savings plan contributions		0	20,358
Issuance of stock in conjunction with acquisition including stock attributed to future compensation			0
Proceeds from the sales of stock through the Employee Stock Purchase Plan (in shares)	11,000
Proceeds from the sales of stock through the Employee Stock Purchase Plan			765
Stock compensation related to restricted stock vesting and retirement savings plan contributions (in shares)	229,000
Purchases of treasury stock and buyback of shares for taxes (in shares)	(184,000)
Foreign currency translation adjustment	$ 8,814					8,814
Purchases of treasury stock and buyback of shares for taxes					(12,708)
Escrow Shares Reqcquired					(425)
Net income	75,758						75,758
Balance at Sep. 30, 2023	$ 502,689	$ 53	424,989	0	(367,669)	(8,705)	454,021	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock in conjunction with acquisition (in shares)	0
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited		(5,000)
Balance (in shares) at Sep. 30, 2023	34,122,836
Balance at Jun. 30, 2023		$ 53	418,123	0	(364,768)	(10,142)	431,425	0
Balance (in shares) at Jun. 30, 2023	34,145,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock compensation related to restricted stock vesting and retirement savings plan contributions		0	6,619
Issuance of stock in conjunction with acquisition including stock attributed to future compensation			0
Proceeds from the sales of stock through the Employee Stock Purchase Plan (in shares)	3,000
Proceeds from the sales of stock through the Employee Stock Purchase Plan			247
Stock compensation related to restricted stock vesting and retirement savings plan contributions (in shares)	21,000
Purchases of treasury stock and buyback of shares for taxes (in shares)	(43,000)
Foreign currency translation adjustment	$ 1,437					1,437
Purchases of treasury stock and buyback of shares for taxes					(2,640)
Escrow Shares Reqcquired					(261)
Net income	22,596						22,596
Balance at Sep. 30, 2023	$ 502,689	$ 53	$ 424,989	$ 0	$ (367,669)	$ (8,705)	$ 454,021	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock in conjunction with acquisition (in shares)	0
Stock Issued During Period, Shares, Escrow Shares	(3,000)
Balance (in shares) at Sep. 30, 2023	34,122,836