Debt (Details) (USD $)	1 Months Ended	9 Months Ended	12 Months Ended			1 Months Ended				1 Months Ended	3 Months Ended		0 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended
	Dec. 31, 2012 properties	Sep. 30, 2011	Dec. 31, 2012 properties	Dec. 31, 2011	Dec. 31, 2010	Nov. 30, 2011 Cancelled Credit Facility [Member]	Nov. 02, 2011 Cancelled Credit Facility [Member]	May 01, 2012 Line of Credit Facility, 2012 Modification [Member]	Apr. 30, 2012 Line of Credit Facility, 2012 Modification [Member]	Apr. 30, 2012 Debt Instrument, Name, 5 Year Term Loan [Member] Line of Credit Facility, 2012 Modification [Member]	Dec. 31, 2012 Debt Instrument, Name, 5 Year Term Loan [Member] Line of Credit Facility, 2012 Modification [Member]	Dec. 31, 2012 Debt Instrument, Name, Revolving Credit Facility [Member]	Apr. 30, 2012 Debt Instrument, Name, Revolving Credit Facility [Member] Line of Credit Facility, 2012 Modification [Member]	Dec. 31, 2012 Debt Instrument, Name, Revolving Credit Facility [Member] Line of Credit Facility, 2012 Modification [Member]	Dec. 31, 2012 Debt Instrument, Name, Revolving Credit Facility [Member] Line of Credit Facility, 2012 Modification [Member]	Dec. 31, 2012 Debt Instrument, Name, 7 Year Term Loan [Member] Line of Credit Facility, 2012 Modification [Member]	May 01, 2012 Debt Instrument, Name, 7 Year Term Loan [Member] Line of Credit Facility, 2012 Modification [Member]	Apr. 30, 2012 Debt Instrument, Name, 7 Year Term Loan [Member] Line of Credit Facility, 2012 Modification [Member]	Dec. 31, 2012 Acquisition Bickford Senior Living [Member] properties	Sep. 29, 2012 Acquisition Bickford Senior Living [Member] properties
Line of Credit Facility, Maximum Borrowing Capacity							$ 200,000,000		$ 320,000,000
Term Loans, Outstanding Balance									120,000,000	80,000,000								40,000,000
Debt Maturity, Years						4,000					5				5	7
Credit Facility Expansion, Amount								130,000,000
Credit Facility, Current Revolving Borrowing Capacity													200,000,000
Number of basis points over LIBOR	22					150				140				140		150
Payments of Debt Issuance Costs		753,000	766,000	0	0
Unused balance of the unsecured revolving credit facility												136,000,000
Interest expense			3,172,000	2,070,000	1,244,000
Amortization of loan costs			320,000	581,000	308,000
Change in fair value of interest rate swap agreement			0	(1,197,000)	0
Interest Expense			3,492,000	3,848,000	1,552,000
Number of Real Estate Properties	107		107																2	2
Significant Acquisition, Cost, Debt Assumed																			19,250,000	19,250,000
Revolving credit facility interest rate																			3.22%
Derivative, Fixed Interest Rate																	3.04%
Debt Instrument, Basis Spread on Variable Rate																			300.00%
Line of Credit Facility, Unused Capacity, Commitment Fee Basis Points						35						35
Debt Instrument, Maturity Date Range, End, Extension													1
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax			$ 1,241,000	$ 0	$ 0