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Debt (Narrative) (Details) (USD $) | 3 Months Ended |  |  | 9 Months Ended |  |  |  |  |  | 9 Months Ended |
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Sep. 30, 2013 | Feb. 08, 2013 | Nov. 18, 2010 | Sep. 30, 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] | Sep. 30, 2013 Unsecured Debt [Member] | Feb. 01, 2012 Unsecured Debt [Member] | Sep. 30, 2013 Senior Secured Credit Facility [Member] | Sep. 30, 2013 Senior Secured Credit Facility [Member] Letters Of Credit [Member] | Sep. 30, 2013 Five Point Seventy Five Percentage Senior Unsecured Notes [Member] | Sep. 30, 2013 Amended Facility [Member] | Sep. 30, 2013 Maximum [Member] Senior Secured Credit Facility [Member] Letters Of Credit [Member] | Sep. 30, 2013 Petroleum Products [Member] Senior Secured Credit Facility [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, amount outstanding |  |  |  |  |  |  |  |  | $ 411,300,000 |  |  |  |  | $ 97,100,000
Credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | 1,000,000,000 |  |
Letters of credit, outstanding amount |  |  |  |  |  |  |  |  |  | 15,300,000 |  |  | 100,000,000 |
Credit facility and senior unsecured notes, maturity dates | Feb. 15, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Total amount available for borrowings under credit facility |  |  |  |  |  |  |  |  | 573,400,000 |  |  |  |  |
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% |  |  |  |  |  |  | 5.75% |  |  |
Senior unsecured notes, percentage of face value |  |  |  |  |  |  |  | 101.00% |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  |  | 7.682% |  |  |  |  |  |
Debt Instrument, Unamortized Premium |  |  |  | $ 804,000 | $ 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 redemption premium for notes repaid up to a specified percentage of the total notes outstanding prior to the specified date. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + 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 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: 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)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 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 + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: 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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- 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 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 2: 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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