Real Property Acquisitions and Development (Schedule of Purchase Price Calculation and Allocation to Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jul. 26, 2018
Business Acquisition [Line Items]
Land and land improvements	$ 117,466	$ 472,500	$ 542,267	$ 417,983
Buildings and improvements	780,048	3,676,958	3,343,355	2,253,451
Acquired lease intangibles	53,386	259,930	130,007	12,820
Real property held for sale		17,435	418,297	418,297
Cash and cash equivalents	1,545,046	284,917		381,913
Restricted cash	475,997	100,849		4,981
Receivables and other assets	1,014	17,220	4,031	1,354
Total assets acquired	951,914	4,538,594	4,437,957
Accrued expenses and other liabilities	(2,612)	(44,917)	(46,558)	(13,199)
Total liabilities assumed	(2,612)	(493,819)	(350,466)
Noncontrolling interests	$ (45,546)	$ (73,203)	$ (527,131)	(512,741)
Quality Care Properties Inc. (QCP)
Business Acquisition [Line Items]
Total assets acquired				3,490,799
Total liabilities assumed				(13,199)
Net assets acquired				$ 2,964,859