Long-Term Debt (Components of Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Jan. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Bank Credit Agreement	$ 340,000		$ 700,000
Pipeline financings	228,167		236,244
Capital lease obligations	128,519		158,260
Total	3,296,782		3,141,428
Less: current obligations	(36,157)		(36,966)
Long-term debt and capital lease obligations	3,260,625		3,104,462
9 1/2% Senior Subordinated Notes due 2016 [Member]
Debt Instrument [Line Items]
Senior subordinated notes	0	224,900	234,038
Including premium of	0		9,118
Debt Instrument, Interest Rate, Stated Percentage	9.50%
9 3/4% Senior Subordinated Notes due 2016 [Member]
Debt Instrument [Line Items]
Senior subordinated notes	0	426,400	412,781
Including discount of	0		13,569
Debt Instrument, Interest Rate, Stated Percentage	9.75%
8 1/4% 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%
4 5/8% Senior Subordinated Notes due 2023 [Member]
Debt Instrument [Line Items]
Senior subordinated notes	1,200,000		0
Debt Instrument, Interest Rate, Stated Percentage	4.625%
Other Subordinated Notes [Member]
Debt Instrument [Line Items]
Senior subordinated notes	3,823		3,832
Including premium of	$ 16		$ 25

Financing Lease Obligations

No definition available.

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- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, collateralized financings, and capital lease obligations.

+ 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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-Topic 840

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (b)

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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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

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 30

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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

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- Definition

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

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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- Definition

Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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-Publisher SEC

-Name Regulation S-X (SX)

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Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer.

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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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-Number 210

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-Subsection 19, 20, 22

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