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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Derivative Instrument, Variable Interest Rate, Term

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- Definition

Effective fixed interest rate on hedged variable interest rate debt

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- Definition

The aggregate fair value of assets needed to immediately settle the derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4H

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624258-113959

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- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80748-113994

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- Definition

Amount of the hedged item as of the balance sheet date related to the derivative. For example, the hedged balance on a debt instrument.

+ References

No definition available.

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- Definition

Average fixed interest rate related to the group of interest rate derivatives.

+ References

No definition available.

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- Definition

Average variable interest rate related to the group of interest rate derivatives.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (a),(c)

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (a),(c),(d),(e)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959

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- Definition

High end of the range of fixed interest rates when a range is presented for a group of interest rate derivatives.

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No definition available.

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- Definition

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 25

-Section 50

-Paragraph 1

-Subparagraph (a)(1),(2)

-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

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- Definition

The effective portion of loss reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

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- Definition

The effective portion of losses on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ 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)

-URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580

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-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (b)

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- Definition

Low end of the range of fixed interest rates when a range is presented for a group of interest rate derivatives.

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No definition available.

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- Definition

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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959

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-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

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- Definition

Variable interest rate in effect as of the balance sheet date related to the interest rate derivative.

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No definition available.

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Derivative Instruments (Details) (USD $)	3 Months Ended
Derivative Instruments (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Derivative [Line Items]
Derivative, Average Fixed Interest Rate	2.04%
Amount of loss on derivative instruments recognized in income	$ (3,000)	$ (2,000)
Derivative, Average Variable Interest Rate	1.00%
Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion	(3,746,000)	(2,067,000)
Number of derivative instruments held	2
Derivative, lower fixed interest rate (percentage)	1.77%
Derivative, higher fixed interest rate (percentage)	2.13%
Estimated gain (loss) expected to be reclassified from accumulated other comprehensive income to income	(6,600,000)
Derivative liability, termination value	12,500,000
LIBOR [Member] \| Interest Rate Swap [Member]
Derivative [Line Items]
Derivative instrument, term for variable interest rate	1 month
Minimum [Member] \| Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, variable interest rate	1.00%
Interest Expense [Member] \| Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion	(3,097,000)	(3,273,000)
Change in Fair Value of Derivative Instruments [Member] \| Interest Rate Swap [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Derivatives Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing)	(3,000)	(2,000)
Designated as Hedging Instrument [Member] \| Other Accrued Liabilities [Member] \| Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Liability, Fair Value	2,149,000		4,149,000
Designated as Hedging Instrument [Member] \| Other Long-term Liabilities [Member] \| Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Liability, Fair Value	9,360,000		6,105,000
Cash Flow Hedges [Member] \| Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Amount of Hedged Item	1,000,000,000
Cash Flow Hedges [Member] \| Designated as Hedging Instrument [Member] \| Fixed Interest Rate [Member] \| Interest Rate Swap [Member]
Derivative [Line Items]
Effective fixed interest rate on hedged variable interest rate debt	5.29%
July 2015 [Member] \| Cash Flow Hedges [Member] \| Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 700,000,000