Condensed Consolidated Statements of Changes in Common Stockholders' Equity Statement - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock	Noncontrolling Interest [Member]
As of at Dec. 31, 2022	$ 3,752,661	$ 20,000	$ 390,438	$ 7,163,128	$ 336,151	$ (4,178,334)	$ 21,278
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	52,977			52,977
Net income attributable to noncontrolling interests	0			(650)			650
Net income attributable to redeemable noncontrolling interests	(55)			(55)
Change in redemption value of redeemable noncontrolling interests	64						64
Noncontrolling interest capital contribution	520						520
Distribution to redeemable noncontrolling interest	0
Dividends on common stock	(15,812)			(15,812)
Repurchase of Class B Common Stock	(23,439)					(23,439)
Issuance of Class B common stock, net of restricted stock award forfeitures	427		(4,067)			4,494
Amortization of unearned stock compensation and stock option expense	1,802		1,802
Other comprehensive income (loss), net of income taxes	585				585
As of at Mar. 31, 2023	3,769,730	20,000	388,173	7,199,588	336,736	(4,197,279)	22,512
As of at Dec. 31, 2022	21,827
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income attributable to redeemable noncontrolling interests	55
Change in redemption value of redeemable noncontrolling interests	70
Distribution to redeemable noncontrolling interest	(70)
As of at Mar. 31, 2023	21,882
As of at Dec. 31, 2022	3,752,661	20,000	390,438	7,163,128	336,151	(4,178,334)	21,278
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	156,014
Other comprehensive income (loss), net of income taxes	(33,454)
As of at Sep. 30, 2023	3,714,141	20,000	387,039	7,284,165	302,697	(4,305,400)	25,640
As of at Dec. 31, 2022	21,827
As of at Sep. 30, 2023	27,882
As of at Mar. 31, 2023	3,769,730	20,000	388,173	7,199,588	336,736	(4,197,279)	22,512
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	124,171			124,171
Net income attributable to noncontrolling interests	0			(809)			809
Net income attributable to redeemable noncontrolling interests	(574)			(574)
Change in redemption value of redeemable noncontrolling interests	(4,499)		(4,550)				51
Distribution to noncontrolling interest	(324)						(324)
Dividends on common stock	(7,722)			(7,722)
Repurchase of Class B Common Stock	(45,643)					(45,643)
Issuance of Class B common stock, net of restricted stock award forfeitures	(183)		61			(244)
Amortization of unearned stock compensation and stock option expense	1,715		1,715
Other comprehensive income (loss), net of income taxes	(4,146)				(4,146)
As of at Jun. 30, 2023	3,832,525	20,000	385,399	7,314,654	332,590	(4,243,166)	23,048
As of at Mar. 31, 2023	21,882
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income attributable to redeemable noncontrolling interests	574
Change in redemption value of redeemable noncontrolling interests	4,604
Distribution to redeemable noncontrolling interest	(61)
As of at Jun. 30, 2023	26,999
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	(21,134)			(21,134)
Net income attributable to noncontrolling interests	0			(1,034)			1,034
Net income attributable to redeemable noncontrolling interests	(863)			(863)
Change in redemption value of redeemable noncontrolling interests	44						44
Noncontrolling interest capital contribution	3,000						3,000
Distribution to noncontrolling interest	(1,486)						(1,486)
Dividends on common stock	(7,458)			(7,458)
Repurchase of Class B Common Stock	(63,166)					(63,166)
Issuance of Class B common stock, net of restricted stock award forfeitures	880		(52)			932
Amortization of unearned stock compensation and stock option expense	1,692		1,692
Other comprehensive income (loss), net of income taxes	(29,893)				(29,893)
As of at Sep. 30, 2023	3,714,141	20,000	387,039	7,284,165	302,697	(4,305,400)	25,640
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income attributable to redeemable noncontrolling interests	863
Change in redemption value of redeemable noncontrolling interests	52
Distribution to redeemable noncontrolling interest	(32)
As of at Sep. 30, 2023	27,882
As of at Dec. 31, 2023	4,001,868	20,000	372,040	7,337,463	614,337	(4,368,103)	26,131
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	125,339			125,339
Net income attributable to noncontrolling interests	0			(633)			633
Net income attributable to redeemable noncontrolling interests	(326)			(326)
Change in redemption value of redeemable noncontrolling interests	284						284
Noncontrolling interest capital contribution	200						200
Distribution to noncontrolling interest	(256)						(256)
Dividends on common stock	(15,352)			(15,352)
Repurchase of Class B Common Stock	(20,227)					(20,227)
Issuance of Class B common stock, net of restricted stock award forfeitures	(227)		(344)			117
Amortization of unearned stock compensation and stock option expense	1,671		1,671
Other comprehensive income (loss), net of income taxes	(22,492)				(22,492)
As of at Mar. 31, 2024	4,070,482	20,000	373,367	7,446,491	591,845	(4,388,213)	26,992
As of at Dec. 31, 2023	24,185
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income attributable to redeemable noncontrolling interests	326
Change in redemption value of redeemable noncontrolling interests	164
Distribution to redeemable noncontrolling interest	(450)
As of at Mar. 31, 2024	24,225
As of at Dec. 31, 2023	4,001,868	20,000	372,040	7,337,463	614,337	(4,368,103)	26,131
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	181,018
Other comprehensive income (loss), net of income taxes	(8,122)
As of at Sep. 30, 2024	4,032,430	20,000	363,224	7,482,936	606,215	(4,468,073)	28,128
As of at Dec. 31, 2023	24,185
As of at Sep. 30, 2024	38,672
As of at Mar. 31, 2024	4,070,482	20,000	373,367	7,446,491	591,845	(4,388,213)	26,992
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	(18,827)			(18,827)
Net income attributable to noncontrolling interests	0			(1,219)			1,219
Net income attributable to redeemable noncontrolling interests	(994)			(994)
Change in redemption value of redeemable noncontrolling interests	(13,011)		(13,342)				331
Distribution to noncontrolling interest	(1,109)						(1,109)
Dividends on common stock	(7,574)			(7,574)
Repurchase of Class B Common Stock	(29,780)					(29,780)
Issuance of Class B common stock, net of restricted stock award forfeitures	0		(36)			36
Amortization of unearned stock compensation and stock option expense	1,648		1,648
Other comprehensive income (loss), net of income taxes	(5,315)				(5,315)
As of at Jun. 30, 2024	3,995,520	20,000	361,637	7,417,877	586,530	(4,417,957)	27,433
As of at Mar. 31, 2024	24,225
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income attributable to redeemable noncontrolling interests	994
Change in redemption value of redeemable noncontrolling interests	13,350
Distribution to redeemable noncontrolling interest	(563)
As of at Jun. 30, 2024	38,006
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	74,506			74,506
Net income attributable to noncontrolling interests	0			(1,166)			1,166
Net income attributable to redeemable noncontrolling interests	(837)			(837)
Change in redemption value of redeemable noncontrolling interests	220						220
Noncontrolling interest capital contribution	200						200
Distribution to noncontrolling interest	(891)						(891)
Dividends on common stock	(7,444)			(7,444)
Repurchase of Class B Common Stock	(49,131)					(49,131)
Issuance of Class B common stock, net of restricted stock award forfeitures	0		(40)			40
Shares withheld related to net share settlement	(1,025)					(1,025)
Amortization of unearned stock compensation and stock option expense	1,627		1,627
Other comprehensive income (loss), net of income taxes	19,685				19,685
As of at Sep. 30, 2024	4,032,430	$ 20,000	$ 363,224	$ 7,482,936	$ 606,215	$ (4,468,073)	$ 28,128
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income attributable to redeemable noncontrolling interests	837
Change in redemption value of redeemable noncontrolling interests	9
Distribution to redeemable noncontrolling interest	(180)
As of at Sep. 30, 2024	$ 38,672