Real Estate Loans Receivable (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Advances on real estate loans receivable:
Investments in new loans	$ 416	$ 0
Draws on existing loans	11,555	10,661
Net cash advances on real estate loans	11,971	10,661
Receipts on real estate loans receivable:
Loan payoffs	42,865	0
Principal payments on loans	7,061	4,301
Total receipts on real estate loans	49,926	4,301
Net advances (receipts) on real estate loans	(37,955)	6,360
Seniors Housing Facilities Triple Net [Member]
Advances on real estate loans receivable:
Investments in new loans	416	0
Draws on existing loans	10,271	10,467
Net cash advances on real estate loans	10,687	10,467
Receipts on real estate loans receivable:
Loan payoffs	42,865	0
Principal payments on loans	6,343	3,689
Total receipts on real estate loans	49,208	3,689
Net advances (receipts) on real estate loans	(38,521)	6,778
Medical facilities [Member]
Advances on real estate loans receivable:
Investments in new loans	0	0
Draws on existing loans	1,284	194
Net cash advances on real estate loans	1,284	194
Receipts on real estate loans receivable:
Loan payoffs	0	0
Principal payments on loans	718	612
Total receipts on real estate loans	718	612
Net advances (receipts) on real estate loans	$ 566	$ (418)