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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of long-term debt	$ 1,191,000
Aggregate carrying value of long-term debt	1,200,000
Interest rate swaps [Member] | Fair value measurements on recurring basis [Member]
Assets (liabilities) measured at fair value on a recurring basis [Abstract]
Fair value of derivatives		(2,973)
Interest rate swaps [Member] | Fair value measurements on recurring basis [Member] | Quoted Prices in Active Markets for Identical Contracts (Level 1) [Member]
Assets (liabilities) measured at fair value on a recurring basis [Abstract]
Fair value of derivatives		0
Interest rate swaps [Member] | Fair value measurements on recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets (liabilities) measured at fair value on a recurring basis [Abstract]
Fair value of derivatives		(2,973)
Commodity contracts [Member] | Fair value measurements on recurring basis [Member]
Assets (liabilities) measured at fair value on a recurring basis [Abstract]
Fair value of derivatives	(28)	111
Commodity contracts [Member] | Fair value measurements on recurring basis [Member] | Quoted Prices in Active Markets for Identical Contracts (Level 1) [Member]
Assets (liabilities) measured at fair value on a recurring basis [Abstract]
Fair value of derivatives	0	0
Commodity contracts [Member] | Fair value measurements on recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets (liabilities) measured at fair value on a recurring basis [Abstract]
Fair value of derivatives	$ (28)	$ 111

X

- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ 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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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Section 45

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 15

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

+ Details

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X

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X

- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20, 22

-Article 5

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X

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

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