Subsequent Event (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended	1 Months Ended
	Dec. 31, 2011	May 31, 2014 Subsequent event Dothan, Alabama item	May 31, 2014 Subsequent event Dothan, Alabama Mortgage notes
Subsequent Event
Number of living units in properties acquired		116
Aggregate purchase price of properties acquired, excluding closing costs		$ 19,914
Assumption of mortgage debt	$ 40,289		$ 13,920