Real Estate Loans Receivable (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Advances on real estate loans receivable:
Investments in new loans	$ 27,109	$ 10,037
Draws on existing loans	21,182	40,680
Net cash advances on real estate loans	48,291	50,717
Receipts on real estate loans receivable:
Loan payoffs	58,557	157,539
Principal payments on loans	32,870	798
Sub-total	91,427	158,337
Less : Non-cash activity	0	(121,837)
Total receipts on real estate loans	91,427	36,500
Net advances (receipts) on real estate loans	(43,136)	14,217
Triple Net
Advances on real estate loans receivable:
Investments in new loans	8,281	10,037
Draws on existing loans	21,182	40,680
Net cash advances on real estate loans	29,463	50,717
Receipts on real estate loans receivable:
Loan payoffs	58,557	97,039
Principal payments on loans	32,870	798
Sub-total	91,427	97,837
Less : Non-cash activity	0	(61,337)
Total receipts on real estate loans	91,427	36,500
Net advances (receipts) on real estate loans	(61,964)	14,217
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	7,022	0
Draws on existing loans	0	0
Net cash advances on real estate loans	7,022	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	$ 7,022	$ 0