Long-Term Debt (Components of Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Bank Credit Agreement	$ 700,000	$ 385,000
Pipeline financings	236,244	243,274
Capital lease obligations	158,260	4,388
Total	3,141,428	2,678,045
Less: current obligations	(36,966)	(8,316)
Long-term debt and capital lease obligations	3,104,462	2,669,729
9.5% Senior Subordinated Notes due 2016 [Member]
Debt Instrument [Line Items]
Senior subordinated notes	234,038	236,774
Including premium of	9,118	11,854
Debt Instrument, Interest Rate, Stated Percentage	9.50%
9.75% Senior Subordinated Notes due 2016 [Member]
Debt Instrument [Line Items]
Senior subordinated notes	412,781	408,496
Including discount of	13,569	17,854
Debt Instrument, Interest Rate, Stated Percentage	9.75%
8.25% Senior Subordinated Notes due 2020 [Member]
Debt Instrument [Line Items]
Senior subordinated notes	996,273	996,273
Debt Instrument, Interest Rate, Stated Percentage	8.25%
6 3/8% Senior Subordinated Notes due 2021 [Member]
Debt Instrument [Line Items]
Senior subordinated notes	400,000	400,000
Debt Instrument, Interest Rate, Stated Percentage	6.375%
Other Subordinated Notes [Member]
Debt Instrument [Line Items]
Senior subordinated notes	3,832	3,840
Including premium of	$ 25	$ 33

Financing Lease Obligations

No definition available.

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- Definition

Long term debt and capital lease obligations, including current obligations and amounts due to related parties in financing transactions.

+ References

No definition available.

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- Definition

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.

+ 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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737

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- Definition

Interest rate stated in the contractual debt agreement.

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Subparagraph (SX 210.5-02.22(a)(1))

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

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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

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

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16, 20

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

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-Publisher FASB

-Name FASB Staff Position (FSP)

-Number APB14-1

-Paragraph 31

-Subparagraph b

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-Topic 835

-SubTopic 30

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-Paragraph 8

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- Definition

The amount of debt premium that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16, 20

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- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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- Definition

Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Paragraph 1

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-Number 210

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section H

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- Definition

Obligation related to long-term debt (excluding convertible debt) and capital leases, the portion which is due in one year or less in the future.

+ References

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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-Name Staff Accounting Bulletin (SAB)

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-Number 210

-Section 02

-Article 5

-Subsection 19, 20, 22

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-Publisher FASB

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-Topic 944

-SubTopic 210

-Section S99

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-Subparagraph (SX 210.7-03.16)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

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