Summary Of Significant Accounting Policies Long-Lived Assets and Impairment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Long-Lived Assets and Impairment [Line Items]
Impairment charge	$ 57,218	$ 0	$ 57,218	$ 0
The Shops at Sunset Place
Long-Lived Assets and Impairment [Line Items]
Ownership interest in joint venture	90.00%		90.00%
Impairment charge	$ 57,200		$ 57,200
Value of impaired asset	57,000		57,000
Non-recourse | Mortgage loan | The Shops at Sunset Place
Long-Lived Assets and Impairment [Line Items]
Principal balance	$ 60,600		$ 60,600