Interest and Debt Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Interest and Debt Expense [Abstract]
Interest expense	$ 113,485	$ 110,296	$ 305,110	$ 328,544
Amortization of deferred financing costs	7,864	6,856	22,817	19,015
Capitalized standby loan commitment termination fee (220 Central Park South development project)	(15,000)	0	(15,000)	0
Capitalized interest and debt expenses	(11,005)	(16,335)	(33,817)	(46,517)
Interest and Debt Expense, Total	$ 95,344	$ 100,817	$ 279,110	$ 301,042