CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Class A	Class B	Common Stock	Common Stock Class A	Common Stock Class B	Additional Paid-in Capital from Treasury Stock Transactions	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss), Net of Tax	Redeemable Noncontrolling Interests in Subsidiaries/ Temporary Equity
Common stock, beginning balance (in shares) at Dec. 31, 2021					9,000	93,410,968
Treasury stock, beginning balance (in shares) at Dec. 31, 2021									16,094,488
Balance, beginning of period at Dec. 31, 2021	$ 1,114,017			$ 449,118			$ 0	$ 1,187,001	$ (538,464)	$ 16,362
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	239,496							239,496
Other Comprehensive Income (Loss), net of tax	(62,038)									(62,038)
Stock Award Activity (in shares)						2,321,592
Stock Award Activity (in shares)									(2,321,592)
Stock Award Activity	36,149			34,724			(46)	(31,181)	$ 32,652
Dividends Declared	(97,842)							(97,842)
Acquisition of Remaining Equity of FHL	37,567						3,518		$ 34,049
Retirement of Treasury Stock (in shares)									(10,000,000)
Retirement of Treasury Stock	0			(42,700)			(3,472)	(267,664)	$ 313,836
Change in Estimated Redemption Value of Redeemable Noncontrolling Interests	(14,221)							(14,221)
Purchase of Treasury stock (in shares)						(6,456,625)			6,456,625
Purchase of Treasury Stock	(207,436)								$ (207,436)
Common stock, ending balance (in shares) at Dec. 31, 2022					9,000	89,275,935
Treasury stock, ending balance (in shares) at Dec. 31, 2022									10,229,521
Balance, end of period at Dec. 31, 2022	1,045,692			441,142			0	1,015,589	$ (365,363)	(45,676)
Balance, beginning of period at Dec. 31, 2021	63,202										$ 63,202
Increase (Decrease) in Temporary Equity [Roll Forward]
Net Income (Loss)	(4,932)										(4,932)
Other Comprehensive Income (Loss), net of tax	(2,329)										(2,329)
Subscriptions – Redeemable Noncontrolling Interest Holders	55,171										55,171
Consolidation/(Deconsolidation)	(435)										(435)
Stock Award Activity	707										707
Distributions to Noncontrolling Interests in Subsidiaries	(25,979)										(25,979)
Acquisition of Remaining Equity of FHL	(37,805)										(37,805)
Change in Estimated Redemption Value of Redeemable Noncontrolling Interests	14,221										14,221
Balance, end of period at Dec. 31, 2022	61,821										61,821
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	298,980							298,980
Other Comprehensive Income (Loss), net of tax	25,765									25,765
Stock Award Activity (in shares)						883,496
Stock Award Activity (in shares)									(883,496)
Stock Award Activity	35,116			33,861			2	(22,003)	$ 23,256
Dividends Declared	(98,005)							(98,005)
Purchase of Treasury stock (in shares)						(5,318,442)			5,318,442
Purchase of Treasury Stock	$ (179,296)								$ (179,296)
Common stock, ending balance (in shares) at Dec. 31, 2023		9,000			9,000	84,840,989
Treasury stock, ending balance (in shares) at Dec. 31, 2023	14,664,467								14,664,467
Balance, end of period at Dec. 31, 2023	$ 1,128,252			475,003			2	1,194,561	$ (521,403)	(19,911)
Increase (Decrease) in Temporary Equity [Roll Forward]
Net Income (Loss)	5,801										5,801
Other Comprehensive Income (Loss), net of tax	585										585
Subscriptions – Redeemable Noncontrolling Interest Holders	72,823										72,823
Consolidation/(Deconsolidation)	(75,225)										(75,225)
Distributions to Noncontrolling Interests in Subsidiaries	(39,960)										(39,960)
Balance, end of period at Dec. 31, 2023	25,845										25,845
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	268,314							268,314
Other Comprehensive Income (Loss), net of tax	(12,172)									(12,172)
Stock Award Activity (in shares)						930,707
Stock Award Activity (in shares)									(930,707)
Stock Award Activity	29,900			28,521			(2)	(21,723)	$ 23,104
Dividends Declared	(184,549)							(184,549)
Purchase of Treasury stock (in shares)			4,000,000.0			(4,012,017)			4,012,017
Purchase of Treasury Stock	$ (134,539)		$ (133,600)						$ (134,539)
Common stock, ending balance (in shares) at Dec. 31, 2024		9,000			9,000	81,759,679
Treasury stock, ending balance (in shares) at Dec. 31, 2024	17,745,777								17,745,777
Balance, end of period at Dec. 31, 2024	$ 1,095,206			$ 503,524			$ 0	$ 1,256,603	$ (632,838)	$ (32,083)
Increase (Decrease) in Temporary Equity [Roll Forward]
Net Income (Loss)	116										116
Other Comprehensive Income (Loss), net of tax	(687)										(687)
Subscriptions – Redeemable Noncontrolling Interest Holders	69,144										69,144
Consolidation/(Deconsolidation)	(7,646)										(7,646)
Distributions to Noncontrolling Interests in Subsidiaries	(31,258)										(31,258)
Balance, end of period at Dec. 31, 2024	$ 55,514										$ 55,514