Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock Voting [Member]	Additional Paid-In Capital [Member]	Treasury Stock - Common Stock Voting [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	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, 2022	1,081,093	123	345,468	(328,326)	1,101,525	(37,697)
Net income	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)