Variable Interest Entities - Summarized Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Assets:
Net Investment in Real Estate	$ 3,186,100	$ 3,025,429
Total Assets	3,662,774	3,518,828
Liabilities and Partners' Capital:
Mortgage Loans Payable, Net	172,510	173,685
Total Liabilities and Equity/Partners' Capital	3,662,774	3,518,828
Other Real Estate Partnerships
Assets:
Net Investment in Real Estate	242,214	240,847
Other Assets, Net	45,039	69,982
Total Assets	287,253	310,829
Liabilities and Partners' Capital:
Mortgage Loans Payable, Net	10,928	11,009
Other Liabilities, Net	19,669	21,088
Partners' Capital	256,656	278,732
Total Liabilities and Equity/Partners' Capital	$ 287,253	$ 310,829