Goodwill and Other Intangible Assets, Net - Goodwill (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Gross Carrying Amount	$ 760,420
Dispositions and Other Reductions	(49,637)
Accumulated Impairment	(556,652)
Net	154,131	$ 154,131
Independent Living
Goodwill [Line Items]
Gross Carrying Amount	28,141
Dispositions and Other Reductions	(820)
Accumulated Impairment	0
Net	27,321
Assisted Living and Memory Care
Goodwill [Line Items]
Gross Carrying Amount	605,469
Dispositions and Other Reductions	(48,817)
Accumulated Impairment	(556,652)
Net	0
Health Care Services
Goodwill [Line Items]
Gross Carrying Amount	126,810
Dispositions and Other Reductions	0
Accumulated Impairment	0
Net	$ 126,810	$ 126,800