Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) shares in Thousands	Common Class A [Member] Common Stock [Member]	Common Class A [Member] Retained Earnings [Member]	Common Class A [Member] Parent [Member]	Common Class A [Member]	Common Class B [Member] Common Stock [Member]	Common Class B [Member] Retained Earnings [Member]	Common Class B [Member] Parent [Member]	Common Class B [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock, Common [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Parent [Member]	Noncontrolling Interest [Member]	Total
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)	$ (10,467,000)	$ (10,467,000)		$ (2,964,000)	$ (2,964,000)	$ (2,964,000)
Foreign currency translation adjustment													(1,891,000)	(1,891,000)		(1,891,000)
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 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
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
Foreign currency translation adjustment																(2,764,000)
Foreign currency translation																(2,764,000)
Net income																150,272,000
Balance at Jun. 30, 2024	$ 61,869,000				$ 16,700,000				816,000	563,604,000	(129,415,000)	1,573,316,000	(4,927,000)	2,003,394,000	19,540,000	2,022,934,000
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
Stock options exercised and stock awards	$ 134,000								1,000	2,098,000				2,099,000		2,099,000
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan										5,515,000				5,515,000		5,515,000
Vesting of restricted share awards										(10,000)				(10,000)		(10,000)
Common stock repurchases (in shares)	(78)				(15)
Common stock repurchases											(3,953,000)			(3,953,000)		(3,953,000)
Cash dividends declared		(10,523,000)	(10,523,000)	(10,523,000)		(3,024,000)	(3,024,000)	(3,024,000)
Foreign currency translation adjustment													(873,000)	(873,000)		(873,000)
Foreign currency translation													(873,000)	(873,000)		(873,000)
Net income												78,661,000		78,661,000	122,000	78,783,000
Balance at Jun. 30, 2024	$ 61,869,000				$ 16,700,000				816,000	563,604,000	(129,415,000)	1,573,316,000	(4,927,000)	2,003,394,000	19,540,000	2,022,934,000
Balance (in shares) at Dec. 31, 2024	62,605				16,663
Balance at Dec. 31, 2024									824,000	587,639,000	(136,235,000)	1,698,614,000	(9,293,000)	2,141,549,000		2,161,903,000
Stock options exercised and stock awards (in shares)	181
Stock options exercised and stock awards									2,000	2,736,000				2,738,000		2,738,000
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan										13,714,000				13,714,000		13,714,000
Vesting of restricted share awards (in shares)					325
Vesting of restricted share awards									3,000	(9,442,000)				(9,439,000)		(9,439,000)
Issuance of common stock under employee stock purchase plan (in shares)	97
Issuance of common stock under employee stock purchase plan									1,000	3,411,000				3,412,000		3,412,000
Common stock repurchases (in shares)	(332)				(233)
Common stock repurchases											(30,939,000)			(30,939,000)		(30,939,000)
Cash dividends declared		(11,296,000)	(11,296,000)	(11,296,000)		(3,113,000)	(3,113,000)	(3,113,000)
Foreign currency translation adjustment													(12,000)	(12,000)		(12,000)
Foreign currency translation													(12,000)	(12,000)		(12,000)
Net income												60,322,000		60,322,000	295,000	60,617,000
Balance at Mar. 31, 2025									830,000	598,058,000	(167,174,000)	1,744,527,000	(9,305,000)	2,166,936,000	20,648,000	2,187,584,000
Balance (in shares) at Dec. 31, 2024	62,605				16,663
Balance at Dec. 31, 2024									824,000	587,639,000	(136,235,000)	1,698,614,000	(9,293,000)	2,141,549,000		2,161,903,000
Foreign currency translation adjustment																5,015,000
Foreign currency translation																5,015,000
Net income																133,606,000
Balance at Jun. 30, 2025	$ 61,123,000				$ 16,615,000				831,000	607,783,000	(253,317,000)	1,802,812,000	(4,278,000)	2,153,831,000	21,200,000	2,175,031,000
Balance (in shares) at Mar. 31, 2025	62,551				16,755
Balance at Mar. 31, 2025									830,000	598,058,000	(167,174,000)	1,744,527,000	(9,305,000)	2,166,936,000	20,648,000	2,187,584,000
Stock options exercised and stock awards	$ 97,000								1,000	1,709,000				1,710,000		1,710,000
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan										8,289,000				8,289,000		8,289,000
Vesting of restricted share awards										(273,000)				(273,000)		(273,000)
Common stock repurchases (in shares)	(1,525)				(140)
Common stock repurchases											(86,143,000)			(86,143,000)		(86,143,000)
Cash dividends declared		$ (10,994,000)	$ (10,994,000)	$ (10,994,000)		$ (3,159,000)	$ (3,159,000)	$ (3,159,000)
Foreign currency translation adjustment													5,027,000	5,027,000		5,027,000
Foreign currency translation													5,027,000	5,027,000		5,027,000
Net income												72,438,000		72,438,000	551,000	72,989,000
Balance at Jun. 30, 2025	$ 61,123,000				$ 16,615,000				$ 831,000	$ 607,783,000	$ (253,317,000)	$ 1,802,812,000	$ (4,278,000)	$ 2,153,831,000	$ 21,200,000	$ 2,175,031,000