Non-Recourse Mortgages and Bonds Payable - Schedule of Debt Principal Payments (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Long-term Debt, Fiscal Year Maturity
2017 (remainder)	$ 2,923
2018	28,328
2019	7,008
2020	124,385
2021	169,231
Thereafter through 2039	885,869
Long term debt gross	1,217,744
Unamortized deferred financing costs	(8,747)
Unamortized premium, net	1,018
Debt, net	$ 1,210,015	$ 1,157,411