Investment in Unconsolidated Real Estate Ventures - Aggregate Principal Payments of Recourse and Non-recourse Debt Payable to Third-parties (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Equity Method Investments [Line Items]
2017	$ 304,931
2018	331,601
2019	7,360
2020	86,978
2021	6,099
Thereafter	1,291,679
Total principal payments	997,466	$ 794,571
Net deferred financing costs	(8,097)
Unconsolidated Real Estate Ventures [Member]
Schedule Of Equity Method Investments [Line Items]
2017	72,520
2018	485,847
2019	274,445
2020	92,261
2021	40,498
Thereafter	31,895
Total principal payments	997,466
Net deferred financing costs	(7,728)
Outstanding indebtedness	$ 989,738	$ 794,571