Variable Interest Entities (VIEs) (Details) - USD ($) $ in Thousands		Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents		$ 234,223	$ 233,097		$ 193,470
Investments in marketable securities		39,490	53,417
Receivables, net		67,263	10,608
Receivables, net – related party		81,526	69,376
Income taxes receivable		12,639	0
Other receivables		13,227	9,647
Prepaid expenses and other current assets		12,670	18,637
Total current assets		461,038	398,782
Non-current assets
Intangible assets, net		76,651	82,807
Goodwill		253,310	253,039
Loan receivable, net of current portion		539	569
Loans receivable – related parties		2,125	0
Investments in other entities – equity method		43,820	41,715
Operating lease right-of-use assets		19,638	15,441
Other assets		5,901	5,928
Total non-current assets		490,026	453,581
Total assets	[1]	951,064	852,363
Current liabilities
Accounts payable and accrued expenses		59,922	43,951
Fiduciary accounts payable		6,071	10,534
Medical liabilities		112,499	55,783	$ 59,307	$ 50,330
Dividends payable		556	556
Current portion of long-term debt		2,413	780
Finance lease liabilities		524	486
Operating lease liabilities		3,253	2,629
Total current liabilities		185,238	115,371
Non-current liabilities
Long-term debt, net of current portion and deferred financing costs		199,068	182,917
Deferred tax liability		9,257	9,127
Finance lease liabilities, net of current portion		1,049	973
Operating lease liabilities, net of current portion		16,904	13,198
Other long-term liabilities		13,706	14,777
Total non-current liabilities		239,984	220,992
Total liabilities	[1]	425,222	336,363
Variable Interest Entity, Primary Beneficiary
Current assets
Cash and cash equivalents		139,299	161,762
Investments in marketable securities		37,807	49,066
Receivables, net		21,601	7,251
Receivables, net – related party		80,324	62,180
Income taxes receivable		4,869	1,342
Other receivables		1,786	1,833
Prepaid expenses and other current assets		6,715	11,734
Loan receivable – related party		0	4,000
Amount due from affiliate		35,960	6,598
Total current assets		328,361	305,766
Non-current assets
Land, property, and equipment, net		85,525	49,547
Intangible assets, net		58,799	58,282
Goodwill		116,145	109,656
Loan receivable, net of current portion		59	0
Loans receivable – related parties		2,125	89
Investment in affiliates		431,270	802,821
Investments in other entities – equity method		31,500	41,715
Investment in privately held entities		405	405
Operating lease right-of-use assets		9,898	4,953
Other assets		2,808	3,219
Total non-current assets		738,534	1,070,687
Total assets		1,066,895	1,376,453
Current liabilities
Accounts payable and accrued expenses		16,087	11,591
Fiduciary accounts payable		6,071	10,534
Medical liabilities		71,509	44,000
Dividends payable		556	556
Current portion of long-term debt		2,413	780
Finance lease liabilities		524	110
Operating lease liabilities		1,906	1,250
Total current liabilities		99,066	68,821
Non-current liabilities
Long-term debt, net of current portion and deferred financing costs		22,795	7,114
Deferred tax liability		3,887	1,982
Finance lease liabilities, net of current portion		1,049	193
Operating lease liabilities, net of current portion		8,333	3,950
Other long-term liabilities		8,542	9,614
Total non-current liabilities		44,606	22,853
Total liabilities		$ 143,672	$ 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 $599.7 million and $567.0 million as of June 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 $143.7 million and $91.7 million as of June 30, 2022 and December 31, 2021, respectively. The VIE balances do not include $431.3 million of investment in affiliates and $36.0 million of amounts due from affiliates as of June 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.