Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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Leases (1535 Broadway) (Details) - 1535 Broadway (Marriott Marquis) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2012
Capital Leased Assets
Capital lease obligations		$ 240,000
Put Option
Capital Leased Assets
Open option contracts written, exercise date	Mar. 31, 2018
Call Option \| After
Capital Leased Assets
Open option contracts written, exercise date	Jul. 30, 2027
Call Option \| Before
Capital Leased Assets
Open option contracts written, exercise date	Jan. 03, 2032
Leaseholds and leasehold improvements
Capital Leased Assets
Redevelopment cost	$ 197,209