Unconsolidated Joint Ventures (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) joint_venture	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Related Party Transaction [Line Items]
Number of joint ventures that qualify as variable interest entities | joint_venture	0
Property operating costs
Related Party Transaction [Line Items]
Reimbursements of property operating costs	$ 8,240	$ 1,869
Property operating costs | Other property income
Related Party Transaction [Line Items]
Reimbursements of property operating costs	1,300	$ 1,200
Prepaid expenses and other assets
Related Party Transaction [Line Items]
Property management fee receivable			$ 600
Prepaid expenses and other assets | Corporate Joint Venture
Related Party Transaction [Line Items]
Property management fee receivable	$ 300