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Long-Term Debt (Details) (USD $) | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Oct. 23, 2013 | Sep. 06, 2013 | May 20, 2013 | Apr. 12, 2013 | Dec. 31, 2012
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 2,500,000,000 |  |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity | 1,300,000,000 |  |  |  |  |  |  |  |  |
Borrowing Base, Line of Credit |  |  |  |  |  | 2,200,000,000 | 1,775,000,000 | 1,900,000,000 |  |
Reduction in Borrowing Base as a Percent of Senior Debt Prinicipal | 25.00% |  |  |  |  |  |  |  |  |
Line of Credit, Covenant Compliance, Maximum Annual Dividend Payment | 50,000,000 |  |  |  |  |  |  |  |  |
Revolving credit facility | 28,000,000 |  |  | 59,000,000 |  |  |  |  | 340,000,000 |
Letters of Credit Outstanding, Amount | 800,000 | [1] |  | 800,000 | [1] |  |  |  | 800,000 | [1]
Line of Credit Facility, Remaining Borrowing Capacity | 1,271,200,000 |  |  | 1,240,200,000 |  |  |  |  | 659,200,000 |
Deferred Finance Costs, Gross | 3,400,000 |  |  |  |  |  |  |  |  |
Proceeds from Debt Issuance, Net of Issuance Costs, 5% Senior Notes | 490,274,000 |  | 0 |  |  |  |  |  |  |
5.0% Senior Notes Due 2024 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate on notes (as a percent) | 5.00% |  |  |  |  |  | 5.00% |  | 5.00% |
Deferred Finance Costs, Gross |  |  |  |  |  |  | 9,700,000 |  |  |
Debt Instrument, Maximum Early Redemption, Percent Of Principal | 35.00% |  |  |  |  |  |  |  |  |
Debt Instrument Future Redemption Price As Percentageof Principal First Through Third Year | 105.00% |  |  |  |  |  |  |  |  |
Debt Instrument, Call Feature | at a redemption price equal to 100 percent of the principal amount of the 2024 Notes to be redeemed, plus a specified make-whole premium and accrued and unpaid interest to the applicable redemption date. |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant Compliance, Dividends Excluded From Computation | 6,500,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 500,000,000 |  |  |
2018 [Member] | 5.0% Senior Notes Due 2024 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Early Debt Redemption, Redemption Price as a Percent of Face Amount | 102.50% |  |  |  |  |  |  |  |  |
2019 [Member] | 5.0% Senior Notes Due 2024 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Early Debt Redemption, Redemption Price as a Percent of Face Amount | 101.667% |  |  |  |  |  |  |  |  |
2020 [Member] | 5.0% Senior Notes Due 2024 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Early Debt Redemption, Redemption Price as a Percent of Face Amount | 100.833% |  |  |  |  |  |  |  |  |
2021 and Thereafter [Member] | 5.0% Senior Notes Due 2024 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Early Debt Redemption, Redemption Price as a Percent of Face Amount | 100.00% |  |  |  |  |  |  |  |  |
[1] | (1) Letters of credit reduce the available borrowing capacity under the credit facility on a dollar-for-dollar basis.

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- Definition Description of a feature that permits the issuer of the debt to repay or convert it before the stated maturity date (early retirement date). The description may include such items as the call price, the period that the issuer can call the debt, including the earliest call date, and other significant terms of the call feature, which may include the debt holders' ability to convert the debt to equity if the call option is exercised and contingent events that trigger the issuer's ability to call the debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 Reference 4: 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(a)(5)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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