Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Accounts payable and accrued expenses	$ 106,420	$ 102,866
Payable to the estate of Leona M. Helmsley	18,367	18,367
Interest rate swap agreements liability	13,378	5,591
Accrued interest payable	3,903	6,230
Due to affiliated companies	622	1,010
Accounts payable and accrued expenses	$ 142,690	$ 134,064