Real Estate Loans Receivable (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Advances on real estate loans receivable:
Investments in new loans	$ 37,427	$ 11,315
Draws on existing loans	29,709	58,736
Net cash advances on real estate loans	67,136	70,051
Receipts on real estate loans receivable:
Loan payoffs	116,161	202,892
Principal payments on loans	33,431	1,121
Sub-total	149,592	204,013
Less : Non-cash activity	0	(121,750)
Total receipts on real estate loans	149,592	82,263
Net advances (receipts) on real estate loans	(82,456)	(12,212)
Triple Net
Advances on real estate loans receivable:
Investments in new loans	10,628	11,315
Draws on existing loans	29,709	58,736
Net cash advances on real estate loans	40,337	70,051
Receipts on real estate loans receivable:
Loan payoffs	116,161	142,392
Principal payments on loans	33,431	1,121
Sub-total	149,592	143,513
Less : Non-cash activity	0	(61,250)
Total receipts on real estate loans	149,592	82,263
Net advances (receipts) on real estate loans	(109,255)	(12,212)
Senior housing - operating
Advances on real estate loans receivable:
Investments in new loans	11,806
Draws on existing loans	0
Net cash advances on real estate loans	11,806
Receipts on real estate loans receivable:
Loan payoffs	0
Principal payments on loans	0
Sub-total	0
Less : Non-cash activity	0
Total receipts on real estate loans	0
Net advances (receipts) on real estate loans	11,806
Outpatient Medical
Advances on real estate loans receivable:
Investments in new loans	14,993	0
Draws on existing loans	0	0
Net cash advances on real estate loans	14,993	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	0	(60,500)
Total receipts on real estate loans	0	0
Net advances (receipts) on real estate loans	$ 14,993	$ 0