UNAUDITED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' DEFICIT - USD ($) $ in Thousands	Total	Parent [Member]	Common Shares Common Class A & B	Common Shares Class C	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]
Balance (in shares) at Dec. 31, 2022			131,724,000	160,909,000
Balance at Dec. 31, 2022	$ 928,814	$ 498,650	$ 132	$ 2	$ 491,899	$ 22,095	$ (15,478)	$ 430,164
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(1,152)				(1,152)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(4,717)
Income attributable to noncontrolling interests	(3,565)							(3,565)
Other Comprehensive Income (Loss), Net of Tax	(6,124)	(3,328)					(3,328)	(2,796)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(10,841)	(4,480)				(1,152)	(3,328)	(6,361)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(19,164)							(19,164)
Changes in redemption value of RNCI	(621)	(621)				(621)
Restricted Awards Granted or Vested (in shares)			3,647,000
Stock Issued During Period, Value, Restricted Stock Award, Gross	174	174	$ 3		171
Shares acquired and cancelled (in shares)			(31,580,000)
Stock Repurchased and Retired During Period, Value	(204,957)	(204,957)	$ (31)		(204,926)
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited			(13,000)
Stock-based compensation	33,883	33,883			33,883
Stock Issued During Period, Shares, Acquisitions			2,853,000
Stock Issued During Period, Value, Acquisitions	20,119	20,119	$ 3		20,116
Change in ownership held by Class C holders		(14,597)			(14,597)			14,597
Conversion of shares (in shares)			9,260,000	(9,260,000)
Stock Issued During Period, Value, Conversion of Units			$ 9		(9)
Stockholders' Equity, Other	(1,516)	(2,251)			(1,612)	(639)		735
Balance (in shares) at Sep. 30, 2023			115,891,000	151,649,000
Balance at Sep. 30, 2023	745,891	325,920	$ 116	$ 2	324,925	19,683	(18,806)	419,971
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Liability modification of certain SARS awards	1,600
Balance (in shares) at Jun. 30, 2023			116,039,000	151,649,000
Balance at Jun. 30, 2023	753,827	318,994	$ 116	$ 2	309,520	22,593	(13,237)	434,833
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		653				653
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	3,117
Income attributable to noncontrolling interests	2,464							2,464
Other Comprehensive Income (Loss), Net of Tax	(13,516)	(5,569)					(5,569)	7,947
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(10,399)	(4,916)				653	(5,569)	5,483
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(8,155)							(8,155)
Changes in redemption value of RNCI	(3,562)	(3,562)				(3,562)
Restricted Awards Granted or Vested (in shares)			670,000
Stock Issued During Period, Value, Restricted Stock Award, Gross	175	175	$ 1		174
Shares acquired and cancelled (in shares)			(818,000)
Stock Repurchased and Retired During Period, Value	(4,605)	(4,605)	$ (1)		(4,604)
Stock-based compensation	17,050	17,050			17,050
Change in ownership held by Class C holders	0	(215)			(215)			215
Stockholders' Equity, Other	1,560	2,999			3,000	(1)		(1,439)
Balance (in shares) at Sep. 30, 2023			115,891,000	151,649,000
Balance at Sep. 30, 2023	745,891	325,920	$ 116	$ 2	324,925	19,683	(18,806)	419,971
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Liability modification of certain SARS awards	3,000
Balance (in shares) at Dec. 31, 2023			118,469,000	151,649,000
Balance at Dec. 31, 2023	825,272	356,695	$ 118	$ 2	348,494	21,148	(13,067)	468,577
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(976)				(976)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	9,197
Income attributable to noncontrolling interests	10,173							10,173
Other Comprehensive Income (Loss), Net of Tax	(959)	11					11	(970)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	8,238	(965)				(976)	11	(9,203)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(21,305)							(21,305)
Reduction of noncontrolling and redeemable noncontrolling interest	(13,295)	(3,069)			(3,069)			(10,226)
Changes in redemption value of RNCI	(8,761)	(8,761)				(8,761)
Restricted Awards Granted or Vested (in shares)			3,606,000
Stock Issued During Period, Value, Restricted Stock Award, Gross	$ 820	820	$ 4		816
Shares acquired and cancelled (in shares)	(13,800,000)		(15,941,000)
Stock Repurchased and Retired During Period, Value	$ (101,381)	(101,381)	$ (16)		(101,365)
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited			(93,000)
Stock-based compensation	29,500	29,500			29,500
Stock Issued During Period, Shares, Acquisitions			4,366,000
Stock Issued During Period, Value, Acquisitions	26,354	26,354	$ 4		26,350
Change in ownership held by Class C holders	0	(13,128)			(13,128)			13,128
Other, Shares			53,000
Stockholders' Equity, Other	(1,170)	347	$ 0		343	5	(1)	(1,517)
Balance (in shares) at Sep. 30, 2024			110,460,000	151,649,000
Balance at Sep. 30, 2024	744,272	286,412	$ 110	$ 2	287,941	11,416	(13,057)	457,860
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Distributions to Class C Shareholders Noncontrolling Interest Holders	19,100
Balance (in shares) at Jun. 30, 2024			111,965,000	151,649,000
Balance at Jun. 30, 2024	729,924	291,570	$ 112	$ 2	292,616	16,771	(17,931)	438,354
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		3,271				3,271
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	13,864
Income attributable to noncontrolling interests	10,593							10,593
Other Comprehensive Income (Loss), Net of Tax	11,666	4,874					4,874	6,792
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	25,530	8,145				3,271	4,874	(17,385)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(231)							(231)
Changes in redemption value of RNCI	(8,626)	(8,626)				(8,626)
Restricted Awards Granted or Vested (in shares)			505,000
Stock Issued During Period, Value, Restricted Stock Award, Gross	289	289	$ 1		288
Shares acquired and cancelled (in shares)			(2,137,000)
Stock Repurchased and Retired During Period, Value	(14,106)	(14,106)	$ (2)		(14,104)
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited			(9,000)
Stock-based compensation	10,492	10,492			10,492
Stock Issued During Period, Shares, Acquisitions			135,000
Stock Issued During Period, Value, Acquisitions	950	950	$ 0		950
Change in ownership held by Class C holders	0	(2,300)			(2,300)			2,300
Other, Shares			1,000
Stockholders' Equity, Other	50	(2)	$ 1		(1)			52
Balance (in shares) at Sep. 30, 2024			110,460,000	151,649,000
Balance at Sep. 30, 2024	$ 744,272	$ 286,412	$ 110	$ 2	$ 287,941	$ 11,416	$ (13,057)	$ 457,860