Schedule IV - Real Estate Mortgage Loans (Mortgage Loan Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Movement in Mortgage Loans on Real Estate [Roll Forward]
Beginning Balance	$ 747,456	$ 335,656	$ 622,139
New Loans	88,648	451,269	3,500
Construction Draws	53,708	0	694
Total additions	142,356	451,269	4,194
Principal Repayments	(99,467)	(21,159)	(75,738)
Conversions to Real Property	0	(18,310)	0
Sales and Syndications	(5,524)	0	(214,939)
Total deductions	(104,991)	(39,469)	(290,677)
Ending Balance	$ 784,821	$ 747,456	$ 335,656