Variable Interest Entities - Summarized Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Assets:
Net Investment in Real Estate	$ 2,589,077	$ 2,588,422
Total Assets	2,805,058	2,793,263
Liabilities and Partners' Capital:
Mortgage Loans Payable, Net	457,442	495,956
Total Liabilities and Equity/Partners' Capital	2,805,058	2,793,263
Other Real Estate Partnerships
Assets:
Net Investment in Real Estate	276,672	278,398
Other Assets, Net	26,312	24,401
Total Assets	302,984	302,799
Liabilities and Partners' Capital:
Mortgage Loans Payable, Net	62,229	70,366
Other Liabilities, Net	9,138	9,138
Partners’ Capital	231,617	223,295
Total Liabilities and Equity/Partners' Capital	$ 302,984	$ 302,799