Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Payables and Accruals [Abstract]
Accounts payable and accrued expenses	$ 78,707	$ 68,488
Payable to the estate of Leona M. Helmsley	18,367	18,367
Interest rate swap agreements liability	4,384	0
Accrued interest payable	3,953	5,953
Due to affiliated companies	1,288	3,755
Accounts payable and accrued expenses	$ 106,699	$ 96,563