Real Estate Loans Receivable (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Advances on real estate loans receivable:
Investments in new loans		$ 15,436	$ 7,828
Draws on existing loans		12,111	17,547
Net cash advances on real estate loans		27,547	25,375
Receipts on real estate loans receivable:
Loan payoffs		58,557	74,974
Principal payments on loans		32,174	667
Sub-total		90,731	75,641
Less : Non-cash activity	[1]	0	(66,849)
Total receipts on real estate loans		90,731	8,792
Net advances (receipts) on real estate loans		(63,184)	16,583
Triple Net [Member]
Advances on real estate loans receivable:
Investments in new loans		1,172	7,828
Draws on existing loans		12,111	17,547
Net cash advances on real estate loans		13,283	25,375
Receipts on real estate loans receivable:
Loan payoffs		58,557	14,474
Principal payments on loans		32,174	667
Sub-total		90,731	15,141
Less : Non-cash activity	[1]	0	(6,349)
Total receipts on real estate loans		90,731	8,792
Net advances (receipts) on real estate loans		(77,448)	16,583
Senior housing - operating [Member]
Advances on real estate loans receivable:
Investments in new loans		11,806	0
Draws on existing loans		0	0
Net cash advances on real estate loans		11,806	0
Receipts on real estate loans receivable:
Loan payoffs		0	0
Principal payments on loans		0	0
Sub-total		0	0
Less : Non-cash activity	[1]	0	0
Total receipts on real estate loans		0	0
Net advances (receipts) on real estate loans		11,806	0
Outpatient Medical [Member]
Advances on real estate loans receivable:
Investments in new loans		2,458	0
Draws on existing loans		0	0
Net cash advances on real estate loans		2,458	0
Receipts on real estate loans receivable:
Loan payoffs		0	60,500
Principal payments on loans		0	0
Sub-total		0	60,500
Less : Non-cash activity	[1]	0	(60,500)
Total receipts on real estate loans		0	0
Net advances (receipts) on real estate loans		$ 2,458	$ 0

[1] Triple-net represents acquisitions of assets previously financed as real estate loans. Please see Note 3 for additional information. Outpatient medical represents a deed in lieu of foreclosure on a previously financed first mortgage property.