Investments in Partially Owned Entities (Latest Financial Information of Fifth Avenue and Times Square JV) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Schedule Of Equity Method Investments
Revenues	$ 363,962	$ 465,961	$ 1,151,520	$ 1,463,732
Net income	65,700	335,438	(102,026)	2,942,187
Fifth Avenue and Times Square JV
Schedule Of Equity Method Investments
Revenues	80,627	85,294	227,413	158,182
Net income	6,750	18,669	16,839	40,135
Net (loss) income attributable to Fifth Avenue and Times Square JV (after allocation to our preferred equity interests)	$ (13,008)	$ (1,559)	$ (41,412)	$ 2,520