Indebtedness - Schedule of Interest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Interest Expense, Long-term Debt	$ 99,987	$ 113,994	$ 110,000
interest expense to loan participant	0	0	110
interest expense credit facility	2,427	4,564	1,964
Interest Expense	102,414	118,558	111,964
Residential Properties
Debt Instrument [Line Items]
Interest Expense, Long-term Debt	55,346	60,676	62,455
Interest Expense	55,346	60,676	62,455
New Market Properties [Member]
Debt Instrument [Line Items]
Interest Expense, Long-term Debt	25,654	26,379	24,566
Interest Expense	25,654	26,379	24,566
Preferred Office Properties [Member]
Debt Instrument [Line Items]
Interest Expense, Long-term Debt	18,987	26,939	22,869
Interest Expense	$ 18,987	$ 26,939	$ 22,869