Long-Term Debt (Components of Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Bank Credit Agreement	$ 445,000	$ 340,000
Pipeline financings	224,171	228,167
Capital lease obligations	115,771	128,519
Total	3,637,689	3,296,782
Less current obligations	(35,533)	(36,157)
Long-term debt and capital lease obligations	3,602,156	3,260,625
8 1/4% Senior Subordinated Notes due 2020 [Member]
Debt Instrument [Line Items]
Senior Subordinated Notes	0	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%
5 1/2% Senior Subordinated Notes Due 2022 [Member]
Debt Instrument [Line Items]
Senior Subordinated Notes	1,250,000	0
Debt Instrument, Interest Rate, Stated Percentage	5.50%
4 5/8% Senior Subordinated Notes Due 2023 [Member]
Debt Instrument [Line Items]
Senior Subordinated Notes	1,200,000	1,200,000
Debt Instrument, Interest Rate, Stated Percentage	4.625%
Other Subordinated Notes [Member]
Debt Instrument [Line Items]
Senior Subordinated Notes	2,747	3,823
Including premium of	$ 13	$ 16

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

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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 premium 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

-Topic 835

-SubTopic 30

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-Paragraph 1A

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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 Staff Accounting Bulletin (SAB)

-Number Topic 6

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- Definition

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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-Subparagraph (SX 210.7-03.16)

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-Number Topic 10

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Article 5

-Subsection 19, 20, 22

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