Acquisitions, Divestitures, and Joint Venture Activities - Price Allocation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Fair value of total consideration transferred
Goodwill	$ 1,748,426	$ 1,259,147	$ 1,219,972
2021 Acquisitions
Consideration
Cash	570,935
Net working capital	890
Fair value of total consideration transferred
Cash	1,352
Patient accounts receivable	14,299
Other receivables	209
Prepaid expenses	441
Other current assets	155
Property and equipment	2,614
Operating lease right of use asset	9,494
Other assets	168
Accounts payable and other accrued liabilities	(10,378)
Salaries, wages, and benefits payable	(7,582)
Current operating lease payable	(3,600)
Amounts due to governmental entities	(4,364)
Current liabilities - deferred employer payroll tax	(1,692)
Operating lease payable	(5,897)
Total identifiable assets and liabilities	82,639
Noncontrolling interest	113
Goodwill	489,299
Goodwill, noncontrolling interest portion		$ 78
2021 Acquisitions | Non-compete agreements
Fair value of total consideration transferred
Finite-lived intangibles	7,257
Trade names | 2021 Acquisitions
Fair value of total consideration transferred
Indefinite-lived intangible assets	39,942
Certificates of need/licenses | 2021 Acquisitions
Fair value of total consideration transferred
Indefinite-lived intangible assets	$ 40,221