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Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Payables and Accruals [Abstract]    
Accounts payable and accrued expenses $ 83,352 $ 68,488
Payable to the estate of Leona M. Helmsley 18,367 18,367
Interest rate swap agreements liability 1,922 0
Accrued interest payable 5,555 5,953
Due to affiliated companies 1,903 3,755
Accounts payable and accrued expenses $ 111,099 $ 96,563