Goodwill and Other Intangible Assets, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Goodwill [Line Items]
Gross Carrying Amount	$ 735,758		$ 735,758		$ 737,574
Accumulated Impairment and Other Charges	(769)		(769)		(769)
Net	734,989		734,989		736,805
Goodwill, Purchase Accounting Adjustments			1,800
Schedule of Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	149,112		149,112		161,607
Accumulated Amortization	(12,967)		(12,967)		(6,834)
Net	136,145		136,145		154,773
Amortization expense related to definite-lived intangible assets	3,000	$ 1,200	6,100	$ 2,400
Retirement Centers [Member]
Goodwill [Line Items]
Gross Carrying Amount	28,141		28,141		28,141
Accumulated Impairment and Other Charges	(521)		(521)		(521)
Net	27,620		27,620		27,620
Assisted Living [Member]
Goodwill [Line Items]
Gross Carrying Amount	580,807		580,807		582,623
Accumulated Impairment and Other Charges	(248)		(248)		(248)
Net	580,559		580,559		582,375
CCRCs Rental [Member]
Goodwill [Line Items]
Gross Carrying Amount	126,810		126,810		126,810
Accumulated Impairment and Other Charges	0		0		0
Net	126,810		126,810		126,810
Community Purchase Options [Member]
Schedule of Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	40,270		40,270		55,738
Accumulated Amortization	0		0		0
Net	40,270		40,270		55,738
Health Care Licenses [Member]
Schedule of Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	67,511		67,511		64,538
Accumulated Amortization	0		0		0
Net	67,511		67,511		64,538
Tradenames [Member]
Schedule of Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	27,800		27,800		27,800
Accumulated Amortization	(9,195)		(9,195)		(4,179)
Net	18,605		18,605		23,621
Other [Member]
Schedule of Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	13,531		13,531		13,531
Accumulated Amortization	(3,772)		(3,772)		(2,655)
Net	$ 9,759		$ 9,759		$ 10,876