Accumulated other comprehensive loss reclassified into interest expense, next twelve months.

No definition available.

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- Definition

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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- Definition

Nominal or face amount used to calculate payments on the derivative liability.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

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- Definition

Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open derivatives, commodity, or energy contracts, held at each balance sheet date, that was included in earnings for the period.

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Derivative Instruments and Hedging Activities - Additional Information (Details)	12 Months Ended
	Dec. 31, 2017 USD ($) Derivative	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Derivative [Line Items]
Change in value of interest rate swaps	$ 10,618,000	$ 8,161,000	$ (9,241,000)
Number of derivative instruments \| Derivative	0
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member] \| Cash Flow Hedges [Member]
Derivative [Line Items]
Change in value of interest rate swaps	$ 10,618,000	8,161,000	(9,241,000)
Estimated accumulated other comprehensive income (loss) reclassified to interest expense in the next twelve months	223,000
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member] \| 1633 Broadway [Member] \| Cash Flow Hedges [Member]
Derivative [Line Items]
Aggregate notional amount	1,000,000,000
Designated as Hedging Instrument [Member] \| Interest Rate Swap March Two Thousand Seventeen [Member] \| 1633 Broadway [Member] \| Cash Flow Hedges [Member]
Derivative [Line Items]
Aggregate notional amount	400,000,000
Not Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member]
Derivative [Line Items]
Derivative liability fair Value		21,227,000
Unrealized gains on interest rate swaps	$ 1,802,000	$ 39,814,000	$ 75,760,000