Investments in Unconsolidated Entities (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Income (loss) from unconsolidated entities	$ (2,632,000)	$ (331,000)	$ (19,705,000)	$ (3,529,000)
Equity Investments	656,213,000		656,213,000		479,629,000
Chartwell [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties in portfolio	41		41
Unamortized basis difference	8,052,000		8,052,000
Chartwell [Member] | Controlling [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties in portfolio	3		3
Chartwell [Member] | Non Controlling [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties in portfolio	38		38
Percentage of partnership owned	50.00%		50.00%
Forest City [Member] | Non Controlling [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties in portfolio	7		7
Percentage of partnership owned	49.00%		49.00%
Sunrise [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties in portfolio	54		54
Sunrise [Member] | Controlling [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties in portfolio	49		49
Sunrise [Member] | Non Controlling [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of partnership owned	20.00%		20.00%
Additional ownership acquired			4%
Senior Resource Group [Member]
Schedule of Equity Method Investments [Line Items]
Equity Investments	214,832,000		214,832,000
Unamortized basis difference	$ 169,266,208		$ 169,266,208
Senior Resource Group [Member] | Non Controlling [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties in portfolio	10		10
Percentage of partnership owned	46.79%		46.79%