Segment Information (Details) $ in Thousands	3 Months Ended
Mar. 31, 2020 USD ($) segment	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| segment	5
Revenue	$ 1,014,139	$ 1,042,044
Segment Operating Income	302,940	239,128
General and administrative expense (including non-cash stock-based compensation expense)	54,595	56,311
Facility lease expense	64,481	68,668
Depreciation and amortization	90,738	96,888
Asset impairment	78,226	391
Loss (gain) on facility lease termination and modification, net	0	209
Income (loss) from operations	14,900	16,661
Total assets	7,501,695		$ 7,194,433
Operating Segments \| Independent Living
Segment Reporting Information [Line Items]
Revenue	135,862	135,694
Segment Operating Income	51,414	52,876
Total assets	1,533,986		1,441,652
Operating Segments \| Assisted Living and Memory Care
Segment Reporting Information [Line Items]
Revenue	457,479	458,526
Segment Operating Income	132,001	140,699
Total assets	4,103,793		4,157,610
Operating Segments \| CCRCs
Segment Reporting Information [Line Items]
Revenue	94,547	103,727
Segment Operating Income	19,931	21,637
Total assets	809,344		742,809
Operating Segments \| Health Care Services
Segment Reporting Information [Line Items]
Revenue	94,819	111,532
Segment Operating Income	(9,121)	8,173
Total assets	257,277		256,715
Operating Segments \| Management Services
Segment Reporting Information [Line Items]
Revenue	231,432	232,565
Segment Operating Income	108,715	$ 15,743
Total assets	$ 797,295		$ 595,647

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