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, 2021	$ 4,411,669	$ 20,000	$ 389,456	$ 7,126,761	$ 971,388	$ (4,108,022)	$ 12,086
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	96,566			96,566
Net income attributable to noncontrolling interest	0			(986)			986
Net (income) loss attributable to redeemable noncontrolling interests	44			44
Change in redemption value of redeemable noncontrolling interest	64						64
Distribution to noncontrolling interest	(357)						(357)
Dividends on common stock	(15,497)			(15,497)
Repurchase of Class B Common Stock	(9,527)					(9,527)
Issuance of Class B common stock, net of restricted stock award forfeitures	1,437					1,437
Amortization of unearned stock compensation and stock option expense	1,677		1,677
Other comprehensive income (loss), net of income taxes	(13,135)				(13,135)
As of at Mar. 31, 2022	4,472,941	20,000	391,133	7,206,888	958,253	(4,116,112)	12,779
As of at Dec. 31, 2021	14,311
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income (loss) attributable to redeemable noncontrolling interests	(44)
Change in redemption value of redeemable noncontrolling interests	64
As of at Mar. 31, 2022	14,331
As of at Dec. 31, 2021	4,411,669	20,000	389,456	7,126,761	971,388	(4,108,022)	12,086
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	29,951
Other comprehensive income (loss), net of income taxes	(66,114)
As of at Jun. 30, 2022	4,322,243	20,000	392,973	7,131,747	905,274	(4,141,303)	13,552
As of at Dec. 31, 2021	14,311
As of at Jun. 30, 2022	16,500
As of at Mar. 31, 2022	4,472,941	20,000	391,133	7,206,888	958,253	(4,116,112)	12,779
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	(66,615)			(66,615)
Noncontrolling interest capital contribution	140						140
Acquisition of noncontrolling interest	512						512
Net income attributable to noncontrolling interest	0			(929)			929
Acquisition of redeemable noncontrolling interest	0
Net (income) loss attributable to redeemable noncontrolling interests	59			59
Change in redemption value of redeemable noncontrolling interest	64						64
Distribution to noncontrolling interest	(872)						(872)
Dividends on common stock	(7,656)			(7,656)
Repurchase of Class B Common Stock	(24,776)					(24,776)
Issuance of Class B common stock, net of restricted stock award forfeitures	(877)		(462)			(415)
Amortization of unearned stock compensation and stock option expense	2,302		2,302
Other comprehensive income (loss), net of income taxes	(52,979)				(52,979)
As of at Jun. 30, 2022	4,322,243	20,000	392,973	7,131,747	905,274	(4,141,303)	13,552
As of at Mar. 31, 2022	14,331
Increase (Decrease) in Temporary Equity [Roll Forward]
Acquisition of redeemable noncontrolling interest	2,164
Net income (loss) attributable to redeemable noncontrolling interests	(59)
Change in redemption value of redeemable noncontrolling interests	64
As of at Jun. 30, 2022	16,500
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
Noncontrolling interest capital contribution	520						520
Net income attributable to noncontrolling interest	0			(650)			650
Net (income) loss attributable to redeemable noncontrolling interests	(55)			(55)
Change in redemption value of redeemable noncontrolling interest	64						64
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 (loss) 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)	177,148
Other comprehensive income (loss), net of income taxes	(3,561)
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 Dec. 31, 2022	21,827
As of at Jun. 30, 2023	26,999
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 interest	0			(809)			809
Net (income) loss attributable to redeemable noncontrolling interests	(574)			(574)
Change in redemption value of redeemable noncontrolling interest	(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 (loss) 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