Investments in Other Entities — Equity Method - Summarized Balance Sheets and Statements of Income (Details) - USD ($) $ in Thousands		3 Months Ended		4 Months Ended	9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Apr. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Assets
Cash and cash equivalents		$ 166,082	$ 230,299		$ 166,082	$ 230,299			$ 103,189			$ 106,892
Receivables, net		18,257			18,257				11,004
Loan receivable		6,425			6,425				6,425
Restricted cash		0			0				75
Property and equipment, net		10,929			10,929				12,130
Total assets	[1]	814,273			814,273				728,713
Liabilities and Stockholders’ Deficit
Current liabilities		131,461			131,461				105,423
Stockholders’ deficit		229,418	192,174		229,418	192,174	$ 207,848	$ 197,961	192,335	$ 186,089	$ 182,377	$ 181,544
Total liabilities and stockholders’ deficit		814,273			814,273				728,713
Statements of Operations
Revenues		180,123	156,060		510,397	381,867
Expenses		142,767	145,994		455,770	360,380
Income from operations		37,356	10,066		54,627	21,487
Other income		130	2,620		1,514	2,832
Income before benefit from income taxes		36,175	14,421		153,616	25,436
Provision (benefit) from income taxes		10,751	3,682		44,204	6,483
Net income (loss)		25,424	$ 10,739		109,412	18,953
LaSalle Medical Associates
Assets
Cash and cash equivalents		3,794			3,794				6,345
Receivables, net		6,782			6,782				5,124
Other current assets		880			880				3,526
Loan receivable		2,250			2,250				2,250
Restricted cash		690			690				683
Total assets		14,396			14,396				17,928
Liabilities and Stockholders’ Deficit
Current liabilities		19,886			19,886				23,530
Stockholders’ deficit		(5,490)			(5,490)				(5,602)
Total liabilities and stockholders’ deficit		14,396			14,396				17,928
Statements of Operations
Revenues					138,490	144,570
Expenses					138,233	155,582
Net income (loss)					257	(11,012)
531 W. College LLC
Assets
Cash and cash equivalents		8			8				139
Other current assets		25			25				17
Other assets		70			70				70
Property and equipment, net		33,697			33,697				33,581
Total assets		33,800			33,800				33,807
Liabilities and Stockholders’ Deficit
Current liabilities		1,257			1,257				1,062
Stockholders’ deficit		32,543			32,543				32,745
Total liabilities and stockholders’ deficit		$ 33,800			33,800				33,807
Statements of Operations
Revenues					0	0
Expenses					828	780
Income from operations					(828)	(780)
Other income					32	427
Provision (benefit) from income taxes					3	0
Net income (loss)					$ (799)	(353)
Universal Care, Inc.
Assets
Cash and cash equivalents									33,890
Receivables, net									63,843
Other current assets									38,280
Loan receivable									882
Restricted cash									4,021
Total assets									140,916
Liabilities and Stockholders’ Deficit
Current liabilities									128,330
Other liabilities									33,133
Stockholders’ deficit									(20,547)
Total liabilities and stockholders’ deficit									$ 140,916
Statements of Operations
Revenues				$ 195,308		372,181
Expenses				189,028		370,597
Income before benefit from income taxes				6,280		1,584
Provision (benefit) from income taxes				0		(11,010)
Net income (loss)				$ 6,280		$ 12,594

[1] The Company's consolidated balance sheets include the assets and liabilities of its consolidated variable interest entities ("VIEs"). The consolidated balance sheets include total assets that can be used only to settle obligations of the Company’s consolidated VIEs totaling $877.6 million and $849.3 million as of September 30, 2020 and December 31, 2019, 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 $113.0 million and $114.5 million as of September 30, 2020 and December 31, 2019, respectively. See Note 15 – Variable Interest Entities (VIEs) for further detail.