Variable Interest Entities (VIEs) - Eliminated Upon Consolidation Included In Accompanying Consolidated Balance Sheets (Details) - USD ($) $ in Thousands		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents		$ 288,027	$ 233,097	$ 193,470
Investment in marketable securities		5,567	53,417
Receivables, net		52,629	10,608
Receivables, net – related party		65,147	69,376
Income taxes receivable		4,015	0
Other receivables		1,834	9,647
Prepaid expenses and other current assets		14,798	18,637
Loans receivable		996	0
Loans receivable — related parties		2,125	4,000
Total current assets		435,138	398,782
Non-current assets
Intangible assets, net		76,861	82,807
Goodwill		275,675	253,039	239,053
Investments in other entities – equity method		40,299	41,715
Operating lease right-of-use assets		20,444	15,441
Other assets		6,056	5,928
Total non-current assets		528,767	453,581
Total assets	[1]	963,905	852,363
Current liabilities
Accounts payable and accrued expenses		49,562	43,951
Fiduciary accounts payable		8,065	10,534
Medical liabilities		84,253	55,783	$ 50,330
Income taxes payable		0	652
Dividend payable		664	556
Finance lease liabilities		594	486
Operating lease liabilities		3,572	2,629
Operating lease liabilities		619	780
Total current liabilities		147,329	115,371
Non-current liabilities
Deferred tax liability		3,042	9,127
Finance lease liabilities, net of current portion		1,275	973
Operating lease liabilities, net of current portion		19,915	13,198
Long-term debt, net of current portion		203,389	182,917
Other long-term liabilities		20,260	14,777
Total non-current liabilities		247,881	220,992
Total liabilities	[1]	395,210	336,363
Variable Interest Entity, Primary Beneficiary
Current assets
Cash and cash equivalents		97,669	161,762
Investment in marketable securities		4,543	49,066
Receivables, net		11,503	7,251
Receivables, net – related party		62,190	62,180
Income taxes receivable		0	1,342
Other receivables		1,236	1,833
Prepaid expenses and other current assets		9,289	11,734
Loans receivable		22	0
Loans receivable — related parties		2,125	4,000
Amounts due from affiliates		30,340	6,598
Total current assets		218,917	305,766
Non-current assets
Land, property and equipment, net		106,486	49,547
Intangible assets, net		53,964	58,282
Goodwill		118,161	109,656
Loans receivable – related parties		0	89
Investments in other entities – equity method		27,561	41,715
Investment in a privately held entity		405	405
Investment in affiliates		304,755	802,821
Operating lease right-of-use assets		6,503	4,953
Other assets		4,169	3,219
Total non-current assets		622,004	1,070,687
Total assets		840,921	1,376,453
Current liabilities
Accounts payable and accrued expenses		23,632	11,591
Fiduciary accounts payable		7,853	10,534
Medical liabilities		48,100	44,000
Income taxes payable		1,083	0
Dividend payable		638	556
Finance lease liabilities		594	110
Operating lease liabilities		1,800	1,250
Operating lease liabilities		619	780
Total current liabilities		84,319	68,821
Non-current liabilities
Deferred tax liability		1,465	1,982
Finance lease liabilities, net of current portion		1,275	193
Operating lease liabilities, net of current portion		7,484	3,950
Long-term debt, net of current portion		26,645	7,114
Other long-term liabilities		8,542	9,614
Total non-current liabilities		45,411	22,853
Total liabilities		$ 129,730	$ 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 $505.8 million and $567.0 million as of December 31, 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 $129.7 million and $91.7 million as of December 31, 2022 and December 31, 2021, respectively. These VIE balances do not include $304.8 million of investment in affiliates and $30.3 million of amounts due from affiliates as of December 31, 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 18 – “Variable Interest Entities (VIEs)” for further detail.