Variable Interest Entities - Summarized Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
ASSETS
Net Investment in Real Estate	$ 2,588,422	$ 2,502,638
Total Assets	2,793,263	2,709,808
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Loans Payable, Net	495,956	561,241
Total Liabilities and Equity/Partners' Capital	2,793,263	2,709,808
Other Real Estate Partnerships
ASSETS
Net Investment in Real Estate	278,398	306,866
Other Assets, Net	24,719	20,104
Total Assets	303,117	326,970
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Loans Payable, Net	70,366	77,071
Other Liabilities, Net	25,392	43,103
Partners' Capital	207,359	206,796
Total Liabilities and Equity/Partners' Capital	$ 303,117	$ 326,970