Variable Interest Entities (VIEs) (Details) - USD ($) $ in Thousands		Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents		$ 184,016	$ 233,097		$ 193,470
Investments in marketable securities		33,281	53,417
Receivables, net		69,386	10,608
Receivables, net – related party		91,208	69,376
Income taxes receivable		12,224	0
Other receivables		41,799	9,647
Prepaid expenses and other current assets		11,702	18,637
Total current assets		443,616	398,782
Non-current assets
Intangible assets, net		73,231	82,807
Goodwill		257,482	253,039
Loan receivable, net of current portion		518	569
Loans receivable – related parties		2,125	0
Investments in other entities – equity method		38,954	41,715
Operating lease right-of-use assets		16,338	15,441
Other assets		6,097	5,928
Total non-current assets		499,790	453,581
Total assets	[1]	943,406	852,363
Current liabilities
Accounts payable and accrued expenses		47,366	43,951
Fiduciary accounts payable		6,506	10,534
Medical liabilities		94,884	55,783	$ 42,872	$ 50,330
Dividends payable		556	556
Current portion of long-term debt		3,162	780
Finance lease liabilities		509	486
Operating lease liabilities		3,208	2,629
Total current liabilities		156,191	115,371
Non-current liabilities
Long-term debt, net of current portion and deferred financing costs		199,150	182,917
Deferred tax liability		4,701	9,127
Finance lease liabilities, net of current portion		931	973
Operating lease liabilities, net of current portion		16,143	13,198
Other long-term liabilities		12,964	14,777
Total non-current liabilities		233,889	220,992
Total liabilities	[1]	390,080	336,363
Variable Interest Entity, Primary Beneficiary
Current assets
Cash and cash equivalents		106,477	161,762
Investments in marketable securities		32,467	49,066
Receivables, net		24,172	7,251
Receivables, net – related party		87,737	62,180
Income taxes receivable		12,456	1,342
Other receivables		2,106	1,833
Prepaid expenses and other current assets		7,662	11,734
Loan receivable – related party		0	4,000
Amount due from affiliate		37,770	6,598
Total current assets		310,847	305,766
Non-current assets
Land, property, and equipment, net		102,152	49,547
Intangible assets, net		56,296	58,282
Goodwill		118,891	109,656
Loan receivable, net of current portion		38	0
Loans receivable – related parties		2,125	89
Investment in affiliates		435,852	802,821
Investments in other entities – equity method		26,470	41,715
Investment in privately held entities		405	405
Operating lease right-of-use assets		6,944	4,953
Other assets		4,282	3,219
Total non-current assets		753,455	1,070,687
Total assets		1,064,302	1,376,453
Current liabilities
Accounts payable and accrued expenses		19,686	11,591
Fiduciary accounts payable		6,506	10,534
Medical liabilities		53,563	44,000
Dividends payable		556	556
Current portion of long-term debt		3,162	780
Finance lease liabilities		509	110
Operating lease liabilities		1,846	1,250
Total current liabilities		85,828	68,821
Non-current liabilities
Long-term debt, net of current portion and deferred financing costs		22,642	7,114
Deferred tax liability		3,325	1,982
Finance lease liabilities, net of current portion		931	193
Operating lease liabilities, net of current portion		7,916	3,950
Other long-term liabilities		8,542	9,614
Total non-current liabilities		43,356	22,853
Total liabilities		$ 129,184	$ 91,674

[1] The Company’s consolidated balance sheets include the assets and liabilities of its consolidated VIEs. The consolidated balance sheets include total assets that can be used only to settle obligations of the Company’s consolidated VIEs totaling $590.7 million and $567.0 million as of September 30, 2022 and December 31, 2021, respectively, and total liabilities of the Company’s consolidated VIEs for which creditors do not have recourse to the general credit of the primary beneficiary of $129.2 million and $91.7 million as of September 30, 2022 and December 31, 2021, respectively. The VIE balances do not include $435.9 million of investment in affiliates and $37.8 million of amounts due from affiliates as of September 30, 2022 and $802.8 million of investment in affiliates and $6.6 million of amounts due from affiliates as of December 31, 2021 as these are eliminated upon consolidation and not presented within the consolidated balance sheets. See Note 16 — “Variable Interest Entities (VIEs)” for further detail.