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 [Member]	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	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	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, 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	52,977			52,977
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
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	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