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Debt (Narrative) (Details) (USD $) | 3 Months Ended |  |  | 3 Months Ended |  |  |  |  |  | 3 Months Ended |  |
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Mar. 31, 2013 | Feb. 08, 2013 | Nov. 18, 2010 | Mar. 31, 2013 7.875% Senior Unsecured Notes [Member] | Dec. 31, 2012 7.875% Senior Unsecured Notes [Member] | Feb. 01, 2012 7.875% Senior Unsecured Notes [Member] | Dec. 31, 2012 Unsecured Debt [Member] | Feb. 01, 2012 Unsecured Debt [Member] | Mar. 31, 2013 Senior Secured Credit Facility [Member] | Mar. 31, 2013 Senior Secured Credit Facility [Member] Letters Of Credit [Member] | Mar. 31, 2013 Five Point Seventy Five Percentage Senior Unsecured Notes [Member] | Jul. 25, 2012 Amended Facility [Member] | Mar. 31, 2013 Maximum [Member] Senior Secured Credit Facility [Member] Letters Of Credit [Member] | Mar. 31, 2013 Petroleum Products [Member] Senior Secured Credit Facility [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, amount outstanding |  |  |  |  |  |  |  |  | $ 271,000,000 |  |  |  |  | $ 64,500,000
Credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | 1,000,000,000 |  |
Letters of credit, outstanding amount |  |  |  |  |  |  |  |  |  | 17,200,000 |  |  | 100,000,000 |
Credit facility and senior unsecured notes, maturity dates | Feb. 15, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Total amount available for borrowings under credit facility |  |  |  |  |  |  |  |  | 711,800,000 |  |  |  |  |
Senior unsecured notes, principal amount |  | 350,000,000 | 250,000,000 |  |  | 100,000,000 | 350,000,000 |  |  |  |  |  |  |
Senior unsecured notes, stated rate |  | 5.75% | 7.875% | 7.875% |  |  |  |  |  |  | 575000.00% |  |  |
Senior unsecured notes, percentage of face value |  |  |  |  |  |  |  | 101.00% |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  |  | 7.682% |  |  |  |  |  |
Debt Instrument, Unamortized Premium |  |  |  | $ 865,000 | $ 895,000 |  |  |  |  |  |  |  |  |
Maximum Percentage Of Principal, Early Debt Redemption |  |  |  | 35.00% |  |  |  |  |  |  | 35.00% |  |  |
Redemption premium for notes |  |  |  | 107.875% |  |  |  |  |  |  | 105.75% |  |  |

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- Definition Maximum percentage of the unsecured notes that can be redeem early prior to the specified date. + References No definition available. + Details
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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: 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. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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