CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Class A	Common Stock	Common Stock Class A	Common Stock Class B	Additional Paid-in Capital from Treasury Stock Transactions	Retained Earnings	Treasury Stock	Treasury Stock Class B	Accumulated Other Comprehensive Income (Loss), Net of Tax	Redeemable Noncontrolling Interests in Subsidiaries/ Temporary Equity
Common stock, beginning balance (in shares) at Dec. 31, 2020				9,000	99,331,443
Treasury stock, beginning balance (in shares) at Dec. 31, 2020								10,174,013
Balance, beginning of period at Dec. 31, 2020	$ 1,136,997		$ 418,858			$ 0	$ 1,027,699	$ (324,731)		$ 15,171
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	270,293						270,293
Other Comprehensive Income (Loss), net of tax	1,191									1,191
Stock Award Activity (in shares)					1,225,363
Stock Award Activity (in shares)								(1,225,363)
Stock Award Activity	31,737		30,260				(24,518)	$ 25,995
Dividends Declared	(105,729)						(105,729)
Change in Estimated Redemption Value of Redeemable Noncontrolling Interests	19,256						19,256
Purchase of Treasury stock (in shares)					(7,145,838)			7,145,838
Purchase of Treasury Stock	(239,728)							$ (239,728)
Common stock, ending balance (in shares) at Dec. 31, 2021				9,000	93,410,968
Treasury stock, ending balance (in shares) at Dec. 31, 2021								16,094,488
Balance, end of period at Dec. 31, 2021	1,114,017		449,118			0	1,187,001	$ (538,464)		16,362
Balance, beginning of period at Dec. 31, 2020	236,987										$ 236,987
Increase (Decrease) in Temporary Equity [Roll Forward]
Net Income (Loss)	2,015										2,015
Other Comprehensive Income (Loss), net of tax	(7,443)										(7,443)
Subscriptions – Redeemable Noncontrolling Interest Holders	998,965										998,965
Consolidation/(Deconsolidation)	(985,248)										(985,248)
Stock Award Activity	9,410										9,410
Distributions to Noncontrolling Interests in Subsidiaries	(4,926)										(4,926)
Acquisition of Additional Equity of FHL	(167,302)										(167,302)
Change in Estimated Redemption Value of Redeemable Noncontrolling Interests	(19,256)										(19,256)
Balance, end of period at Dec. 31, 2021	63,202										63,202
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 Additional 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		9,000	89,275,935
Treasury stock, ending balance (in shares) at Dec. 31, 2022	10,229,521							10,229,521
Balance, end of period at Dec. 31, 2022	$ 1,045,692		441,142			0	1,015,589	$ (365,363)		(45,676)
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 Additional 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	5,300,000
Purchase of Treasury Stock	$ (179,296)							$ (179,296)	$ (178,000)
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