Long-Term Debt (Components of Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Bank Credit Agreement	$ 395,000us-gaap_LineOfCredit	$ 340,000us-gaap_LineOfCredit
Pipeline financings	220,583dnr_FinancingLeaseObligations	228,167dnr_FinancingLeaseObligations
Capital lease obligations	103,041us-gaap_CapitalLeaseObligations	128,519us-gaap_CapitalLeaseObligations
Total	3,571,370us-gaap_DebtAndCapitalLeaseObligations	3,296,782us-gaap_DebtAndCapitalLeaseObligations
Less: current obligations	(35,470)	(36,157)
Long-term debt and capital lease obligations	3,535,900	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	2,746	3,823
Including premium of	$ 11	$ 16

Financing Lease Obligations

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.

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-Publisher SEC

-Name Regulation S-X (SX)

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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, and capital lease obligations.

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- Definition

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

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-Number 210

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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.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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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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-Number Topic 6

-Section H

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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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-Number 210

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-Subsection 19, 20, 22

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