Real Estate (Schedule of Pro Forma Information on CFA Business Acquisition) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended			11 Months Ended	12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2010 Acquisition Care Foundation of America [Member]	Dec. 31, 2010 Acquisition Care Foundation of America [Member]	Dec. 31, 2009 Acquisition Care Foundation of America [Member]
Rental income									$ 76,050	$ 71,289	$ 53,648	$ 5,907
Net Income	18,114	18,808	25,117	19,093	16,954	17,334	19,189	15,944	81,132	69,421	64,229	4,479
Business Acquisition, Pro Forma Revenue													78,933	69,601
Business Acquisition, Pro Forma Net Income (Loss)													$ 69,828	$ 69,115