Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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

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No definition available.

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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.

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
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- Definition

Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (d)
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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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-Paragraph 28
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Derivative Instruments and Hedging Activities - Additional Information (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($) Derivative	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) Derivative	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Derivative [Line Items]
Interest rate swap liabilities	$ 82,046,000		$ 82,046,000		$ 93,936,000
Change in value of interest rate swaps	7,802,000	$ (18,602,000)	(33,812,000)	$ (18,602,000)
Not Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member]
Derivative [Line Items]
Interest rate swap liabilities	$ 38,993,000		$ 38,993,000		84,695,000
Number of derivatives \| Derivative	11		11
Aggregate notional amount	$ 1,000,000,000		$ 1,000,000,000
Unrealized gains on interest rate swaps	12,728,000	15,772,000	29,661,000	49,497,000
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member] \| Cash Flow Hedges [Member]
Derivative [Line Items]
Interest rate swap liabilities	43,053,000		43,053,000		$ 9,241,000
Change in value of interest rate swaps	$ 7,802,000	$ (18,602,000)	(33,812,000)	$ (18,602,000)
Estimated accumulated other comprehensive loss reclassified to interest expense in the next twelve months			$ 11,127,000
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member] \| 1633 Broadway [Member] \| Cash Flow Hedges [Member]
Derivative [Line Items]
Number of derivatives \| Derivative	3		3
Aggregate notional amount	$ 1,000,000,000		$ 1,000,000,000
Designated as Hedging Instrument [Member] \| Interest Rate Swap March Two Thousand Sixteen [Member] \| 1633 Broadway [Member] \| Cash Flow Hedges [Member]
Derivative [Line Items]
Aggregate notional amount	$ 400,000,000		$ 400,000,000