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	52,977			52,977
Net income attributable to noncontrolling interest	0			(650)			650
Net income 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, 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, 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	125,339			125,339
Net income attributable to noncontrolling interest	0			(633)			633
Net income attributable to redeemable noncontrolling interests	(326)			(326)
Change in redemption value of redeemable noncontrolling interest	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