Interest and Debt Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Interest and Debt Expense [Abstract]
Interest expense	$ 98,210	$ 113,485	$ 302,940	$ 305,110
Amortization of deferred financing costs	8,539	7,864	26,312	22,817
Capitalized interest and debt expense	(8,384)	(11,005)	(24,822)	(33,817)
Capitalized standby loan commitment termination fee (220 Central Park South development project)	0	(15,000)	0	(15,000)
Interest and Debt Expense, Total	$ 98,365	$ 95,344	$ 304,430	$ 279,110