Schedule IV - Mortgage Loans on Real Estate (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Rollforward of Mortgage loans on real estate
Balance at beginning of period	$ 0	$ 1,900	$ 125,547
Additions during period:
New or acquired mortgages	0	0	1,900
Increased funding on existing mortgages	0	0	1,244
Additions during period, total	0	0	3,144
Deductions during period:
Principal repayments and reductions	0	(1,900)	(5,605)
Principal reductions due to acquisitions	0	0	(81,213)
Mortgage eliminated in consolidation	0	0	(39,973)
Deductions during period, total	0	(1,900)	(126,791)
Balance at end of period	$ 0	$ 0	$ 1,900