Variable Interest Entities - Summarized Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Assets:
Net Investment in Real Estate	$ 3,247,998	$ 3,025,429
Total Assets	3,738,857	3,518,828
Liabilities and Partners' Capital:
Mortgage Loans Payable, Net	155,270	173,685
Total Liabilities and Equity/Partners' Capital	3,738,857	3,518,828
Other Real Estate Partnerships
Assets:
Net Investment in Real Estate	244,914	240,847
Other Assets, Net	42,778	69,982
Total Assets	287,692	310,829
Liabilities and Partners' Capital:
Mortgage Loans Payable, Net	6,334	11,009
Other Liabilities, Net	24,066	21,088
Partners' Capital	257,292	278,732
Total Liabilities and Equity/Partners' Capital	$ 287,692	$ 310,829