Corporate Indebtedness - Schedule of Consolidated Interest Expense, Excluding Capitalized Interest (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Interest expense
Interest expense before capitalized interest	$ 60,745	$ 61,553	$ 121,555	$ 116,471
Interest on financing leases	808	0	1,612	0
Interest capitalized	(12,019)	(7,594)	(22,528)	(14,280)
Interest income	(2,374)	(348)	(2,954)	(664)
Interest expense, net	$ 47,160	$ 53,611	$ 97,685	$ 101,527