Accounting Policies and Related Matters (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Agreements with residents, term	1 year
Agreements with residents, cancelable period	30 days
Redeemable noncontrolling interests, carrying value	$ 475,877
Current redemption value of redeemable noncontrolling interest that exceeded the carrying value	14,953
Lease liabilities	$ 364,803
Buildings | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Properties, estimated useful life	15 years
Buildings | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Properties, estimated useful life	40 years
Improvements | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Properties, estimated useful life	5 years
Improvements | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Properties, estimated useful life	15 years
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right of use assets		$ 509,386
Lease liabilities		$ 357,070