Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock Voting [Member]	Additional Paid-In Capital [Member]	Treasury Stock, Common [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning Balance at Dec. 31, 2021	$ 1,041,309	$ 123	$ 330,262	$ (232,712)	$ 956,966	$ (13,330)
Net Income (Loss)	64,769				64,769
Cumulative translation adjustment	(5,051)					(5,051)
Stock-based compensation	8,099		8,099
Exercise of stock options	50		50
Withholding tax payments on restricted stock vesting and stock option exercises	(20,292)		(20,292)
Repurchases of common stock	(38,800)			(38,800)
Cash dividend on common stock	(26,543)				(26,543)
Ending Balance at Mar. 31, 2022	1,023,541	123	318,119	(271,512)	995,192	(18,381)
Beginning Balance at Dec. 31, 2021	1,041,309	123	330,262	(232,712)	956,966	(13,330)
Net Income (Loss)	190,998
Cumulative translation adjustment	(46,757)
Ending Balance at Sep. 30, 2022	1,018,740	123	330,294	(320,252)	1,068,662	(60,087)
Beginning Balance at Mar. 31, 2022	1,023,541	123	318,119	(271,512)	995,192	(18,381)
Net Income (Loss)	66,922				66,922
Cumulative translation adjustment	(21,458)					(21,458)
Stock-based compensation	6,503		6,503
Exercise of stock options	86		86
Withholding tax payments on restricted stock vesting and stock option exercises	339		339
Repurchases of common stock	(48,740)			(48,740)
Cash dividend on common stock	(26,391)				(26,391)
Ending Balance at Jun. 30, 2022	1,000,802	123	325,047	(320,252)	1,035,723	(39,839)
Net Income (Loss)	59,307				59,307
Cumulative translation adjustment	(20,248)					(20,248)
Stock-based compensation	7,351		7,351
Exercise of stock options	148		148
Withholding tax payments on restricted stock vesting and stock option exercises	(2,252)		(2,252)
Repurchases of common stock	0			0
Cash dividend on common stock	(26,368)				(26,368)
Ending Balance at Sep. 30, 2022	1,018,740	123	330,294	(320,252)	1,068,662	(60,087)
Beginning Balance at Dec. 31, 2022	1,081,093	123	345,468	(328,326)	1,101,525	(37,697)
Net Income (Loss)	73,628				73,628
Cumulative translation adjustment	5,755					5,755
Unrealized net gain (loss) on securities available-for-sale, net of tax	(41)					(41)
Stock-based compensation	7,488		7,488
Reissuance of treasury stock	454		(57)	511
Exercise of stock options	707		707
Withholding tax payments on restricted stock vesting and stock option exercises	(20,492)		(20,492)
Cash dividend on common stock	(27,060)				(27,060)
Ending Balance at Mar. 31, 2023	1,121,532	123	333,114	(327,815)	1,148,093	(31,983)
Beginning Balance at Dec. 31, 2022	1,081,093	123	345,468	(328,326)	1,101,525	(37,697)
Net Income (Loss)	188,428
Cumulative translation adjustment	274
Ending Balance at Sep. 30, 2023	1,190,978	123	346,947	(327,091)	1,208,607	(37,608)
Beginning Balance at Mar. 31, 2023	1,121,532	123	333,114	(327,815)	1,148,093	(31,983)
Net Income (Loss)	59,859				59,859
Cumulative translation adjustment	4,206					4,206
Unrealized net gain (loss) on securities available-for-sale, net of tax	(126)					(126)
Stock-based compensation	6,890		6,890
Exercise of stock options	18		18
Withholding tax payments on restricted stock vesting and stock option exercises	(155)		(155)
Cash dividend on common stock	(27,132)				(27,132)
Ending Balance at Jun. 30, 2023	1,165,092	123	339,867	(327,815)	1,180,820	(27,903)
Net Income (Loss)	54,941				54,941
Cumulative translation adjustment	(9,687)					(9,687)
Unrealized net gain (loss) on securities available-for-sale, net of tax	(18)					(18)
Stock-based compensation	7,481		7,481
Reissuance of treasury stock	539		(185)	724
Withholding tax payments on restricted stock vesting and stock option exercises	(216)		(216)
Cash dividend on common stock	(27,154)				(27,154)
Ending Balance at Sep. 30, 2023	$ 1,190,978	$ 123	$ 346,947	$ (327,091)	$ 1,208,607	$ (37,608)