Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) shares in Thousands	Common Stock [Member] Common Class A [Member]	Common Stock [Member] Common Class B [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock, Common [Member]	Retained Earnings [Member] Common Class A [Member]	Retained Earnings [Member] Common Class B [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Parent [Member] Common Class A [Member]	Parent [Member] Common Class B [Member]	Parent [Member]	Noncontrolling Interest [Member]	Common Class A [Member]	Common Class B [Member]	Total
Balance (in shares) at Dec. 31, 2022	63,518	18,125
Balance at Dec. 31, 2022			$ 572,000	$ 500,642,000	$ (130,930,000)			$ 1,378,337,000	$ (4,130,000)			$ 1,744,491,000	$ 18,531,000			$ 1,763,022,000
Stock options exercised and stock awards (in shares)	228
Stock options exercised and stock awards			2,000	3,412,000								3,414,000				3,414,000
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan				13,080,000								13,080,000
Vesting of restricted share awards (in shares)		422
Vesting of restricted share awards			3,000	(6,964,000)								(6,961,000)				(6,961,000)
Issuance of common stock under employee stock purchase plan (in shares)	102
Issuance of common stock under employee stock purchase plan				2,828,000								2,828,000				2,828,000
Common stock repurchases (in shares)	(623)	(84)
Common stock repurchases					(25,280,000)							(25,280,000)				(25,280,000)
Cash dividends declared						$ (8,897,000)	$ (2,692,000)			$ (8,897,000)	$ (2,692,000)
Foreign currency translation									232,000			232,000				232,000
Net income								90,455,000				90,455,000	335,000			90,790,000
Balance (in shares) at Mar. 31, 2023	63,225	18,463
Balance at Mar. 31, 2023			577,000	512,998,000	(156,210,000)			1,457,203,000	(3,898,000)			1,810,670,000	18,866,000			1,829,536,000
Balance (in shares) at Dec. 31, 2023	61,461	16,364
Balance at Dec. 31, 2023			806,000	542,046,000	(119,835,000)			1,450,025,000	(2,163,000)			1,870,879,000				1,890,416,000
Stock options exercised and stock awards (in shares)	383
Stock options exercised and stock awards			4,000	5,997,000								6,001,000				6,001,000
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan				14,090,000								14,090,000				14,090,000
Vesting of restricted share awards (in shares)		351
Vesting of restricted share awards			4,000	(9,486,000)								(9,482,000)				(9,482,000)
Issuance of common stock under employee stock purchase plan (in shares)	97
Issuance of common stock under employee stock purchase plan			1,000	3,354,000								3,355,000				3,355
Common stock repurchases (in shares)	(128)
Common stock repurchases					(5,627,000)							(5,627,000)				(5,627,000)
Cash dividends declared						$ (10,467,000)	$ (2,964,000)			$ (10,467,000)	$ (2,964,000)			$ (10,467,000)	$ (2,964,000)
Foreign currency translation									(1,891,000)			(1,891,000)				(1,891,000)
Net income								71,608,000				71,608,000	(119,000)			71,489,000
Balance (in shares) at Mar. 31, 2024	61,813	16,715
Balance at Mar. 31, 2024			$ 815,000	$ 556,001,000	$ (125,462,000)			$ 1,508,202,000	$ (4,054,000)			$ 1,935,502,000	$ 19,418,000			$ 1,954,920,000