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, 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 for the period	125,339			125,339
Net income attributable to nonredeemable noncontrolling interest	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
Distributions to noncontrolling interests	(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
Distributions to noncontrolling interests	(450)
As of at Mar. 31, 2024	24,225
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 interest	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 income (loss), 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