Real Property Acquisitions and Development Real Property Acquisitions and Development (Details 1) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Real estate held-for-sale	$ 619,141	$ 734,147
Cash and cash equivalents	191,199	243,777
Restricted cash	90,086	$ 65,526
Quality Care Properties Inc [Member]
Business Acquisition [Line Items]
Land and land improvements	417,983
Buildings and improvements	2,249,803
Acquired lease intangibles	15,512
Real estate held-for-sale	418,297
Cash and cash equivalents	381,913
Restricted cash	4,981
Receivables and other assets	1,322
Total assets acquired	3,489,811
Accrued expenses and other liabilities	(13,199)
Total liabilities assumed	(13,199)
Noncontrolling interests	(512,741)
Net assets acquired	$ 2,963,871