Condensed Consolidated Statements of Changes in Common Stockholders' Equity Statement - USD ($) $ in Thousands	Total	Common Stock [Member]	Capital in Excess of Par Value [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]
As of at Dec. 31, 2024	$ 4,286,815	$ 20,000	$ 356,919	$ 8,031,750	$ 334,797	$ (4,486,805)	$ 30,154
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income for the period	25,721			25,721
Net income attributable to nonredeemable noncontrolling interests	0			(1,129)			1,129
Net income attributable to redeemable noncontrolling interests	(698)			(698)
Change in redemption value of redeemable noncontrolling interests	634						634
Noncontrolling interest capital contribution	180						180
Distributions to noncontrolling interests	(747)						(747)
Dividends on common stock	(15,662)			(15,662)
Repurchase of Class B Common Stock	(3,468)					(3,468)
Issuance of Class B common stock, net of restricted stock award forfeitures	18,572		9,431			9,141
Shares withheld related to net share settlement	(402)					(402)
Amortization of unearned stock compensation and stock option expense	1,724		1,724
Other comprehensive (loss) income, net of income taxes	13,096				13,096
As of at Mar. 31, 2025	4,325,765	20,000	368,074	8,039,982	347,893	(4,481,534)	31,350
As of at Dec. 31, 2024	43,821
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income attributable to redeemable noncontrolling interests	698
Change in redemption value of redeemable noncontrolling interests	8
Distributions to noncontrolling interests	(941)
As of at Mar. 31, 2025	43,586
As of at Dec. 31, 2025	4,827,327	20,000	379,896	8,292,681	587,080	(4,485,632)	33,302
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income for the period	30,751			30,751
Net income attributable to nonredeemable noncontrolling interests	0			(699)			699
Net income attributable to redeemable noncontrolling interests	(946)			(946)
Change in redemption value of redeemable noncontrolling interests	(8,229)		(8,225)				(4)
Distributions to noncontrolling interests	(884)						(884)
Dividends on common stock	(16,398)			(16,398)
Repurchase of Class B Common Stock	(34,476)					(34,476)
Issuance of Class B common stock, net of restricted stock award forfeitures	(28)		(252)			224
Shares withheld related to net share settlement	(434)					(434)
Amortization of unearned stock compensation and stock option expense	1,525		1,525
Purchase of noncontrolling interest	(25,062)		(26,001)				939
Other comprehensive (loss) income, net of income taxes	(6,342)				(6,342)
Purchase of redeemable noncontrolling interest	0
As of at Mar. 31, 2026	4,766,804	$ 20,000	$ 346,943	$ 8,305,389	$ 580,738	$ (4,520,318)	$ 34,052
As of at Dec. 31, 2025	39,824
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income attributable to redeemable noncontrolling interests	946
Change in redemption value of redeemable noncontrolling interests	8,250
Distributions to noncontrolling interests	(2,251)
Purchase of redeemable noncontrolling interest	(16,849)
As of at Mar. 31, 2026	$ 29,920