Corporate Indebtedness - Schedule of Consolidated Interest Expense, Excluding Capitalized Interest (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest expense
Interest expense before capitalized interest	$ 72,859	$ 78,715	$ 217,273	$ 276,437
Interest capitalized	(6,869)	(6,084)	(19,892)	(18,135)
Interest income	(356)	(66)	(1,269)	(1,976)
Interest expense, net	$ 65,634	$ 72,565	$ 196,112	$ 256,326