Supplemental Disclosure of Cash Flow Information - Supplemental Schedule of Non-Cash Operating, Investing and Financing Activities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Acquisition of assets, net of related payables [Line Items]
Treasury stock	$ 18,123	$ 19,710	$ 8,500
Prepaid expenses and other assets, net	(24,707)	(55,873)	(26,762)
Loss (gain) on sale of assets, net	(374,532)	(7,245)	(293,246)
Loss (gain) on facility lease termination and modification, net	(2,303)	3,388	162,001
Purchase of treasury stock
Acquisition of assets, net of related payables [Line Items]
Treasury stock	0	0	4,244
Net	0	0	0
Accounts payable	0	0	(4,244)
Assets designated as held for sale
Acquisition of assets, net of related payables [Line Items]
Net	0	0	0
Prepaid expenses and other assets, net	0	0	(517)
Assets held for sale	7,935	28,608	198,445
Property, plant and equipment and leasehold intangibles, net	(7,935)	(28,608)	(197,928)
Healthpeak master lease modification
Acquisition of assets, net of related payables [Line Items]
Net	0	0	0
Property, plant and equipment and leasehold intangibles, net	57,462	0	0
Operating lease right-of-use assets	(88,044)	0	0
Financing lease obligations	70,874	0	0
Operating lease obligations	(101,456)	0	0
Lease termination and modification, net
Acquisition of assets, net of related payables [Line Items]
Net	0	0	0
Prepaid expenses and other assets, net	0	(636)	(248)
Property, plant and equipment and leasehold intangibles, net	10,707	(1,963)	(132,733)
Operating lease right-of-use assets	(7,941)	18,148	0
Financing lease obligations	(15,483)	0	165,918
Operating lease obligations	15,126	(18,206)	0
Deferred liabilities	0	0	(122,304)
Other liabilities	(77)	(731)	(620)
Loss (gain) on sale of assets, net	0	0	(37,731)
Loss (gain) on facility lease termination and modification, net	$ (2,332)	$ 3,388	$ 127,718