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Debt (Narrative) (Details) (USD $) | 12 Months Ended |  |  |  |  |  |  | 12 Months Ended |  | 12 Months Ended |  |  |  |  | 12 Months Ended |  | 12 Months Ended |
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Dec. 31, 2012 | Dec. 31, 2012 Letter Of Credit [Member] | Dec. 31, 2012 Senior Secured Credit Facility [Member] | Jul. 25, 2012 Senior Secured Credit Facility [Member] | Dec. 31, 2012 Senior Secured Credit Facility [Member] Crude Oil And Petroleum Products Inventory [Member] | Jul. 25, 2012 Senior Secured Credit Facility [Member] Crude Oil And Petroleum Products Inventory [Member] | Dec. 31, 2012 Senior Secured Credit Facility [Member] Letter Of Credit [Member] | Jul. 25, 2012 Senior Secured Credit Facility [Member] Accordion [Member] | Dec. 31, 2012 Senior Unsecured Notes [Member] | Feb. 01, 2012 Senior Unsecured Notes [Member] | Dec. 31, 2012 7.875% Senior Unsecured Notes [Member] | Dec. 31, 2010 7.875% Senior Unsecured Notes [Member] | Feb. 01, 2012 7.875% Senior Unsecured Notes [Member] | Nov. 30, 2010 7.875% Senior Unsecured Notes [Member] | Dec. 31, 2012 Federal Funds Effective Rate [Member] | Dec. 31, 2012 Eurodollar Rate [Member] | Dec. 31, 2012 Applicable Margin [Member] | Nov. 30, 2010 CHOPS [Member] | Dec. 31, 2012 Maximum [Member] | Dec. 31, 2011 Maximum [Member] Senior Secured Credit Facility [Member] | Dec. 31, 2012 Maximum [Member] Senior Secured Credit Facility [Member] Letter Of Credit [Member] | Dec. 31, 2012 Maximum [Member] Federal Funds Effective Rate [Member] | Dec. 31, 2012 Maximum [Member] LIBOR Rate [Member] | Dec. 31, 2012 Maximum [Member] Alternate Base Rate [Member] | Dec. 31, 2012 Maximum [Member] Eurodollar Rate [Member] | Dec. 31, 2012 Minimum [Member] | Dec. 31, 2011 Minimum [Member] Senior Secured Credit Facility [Member] | Dec. 31, 2012 Minimum [Member] Alternate Base Rate [Member] | Dec. 31, 2012 Minimum [Member] Eurodollar Rate [Member] | Dec. 31, 2011 During Acquisition Period [Member] Maximum [Member] Senior Secured Credit Facility [Member] | Dec. 31, 2011 During Acquisition Period [Member] Minimum [Member] Senior Secured Credit Facility [Member] | Jul. 25, 2012 Amended Facility [Member] Senior Secured Credit Facility [Member] | Jul. 25, 2012 Amended Facility [Member] Senior Secured Credit Facility [Member] Crude Oil And Petroleum Products Inventory [Member] | Jul. 25, 2012 Amended Facility [Member] Senior Secured Credit Facility [Member] Accordion [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior secured credit facility, maximum borrowing capacity |  |  |  | $ 775,000,000 |  | $ 125,000,000 |  | $ 225,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 | $ 150,000,000 | $ 300,000,000
Line of credit facility, aggregate maximum borrowing capacity |  |  |  | 1,300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spreads senior secured credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% | 2.00% | 1.00% |  |  |  |  | 1.00% | 1.00% |  |  |  |  |  |  |  |  |  |  |
Letter of credit, fee percentage |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.75% | 1.75% |  |  | 1.75% | 0.75% |  |  |  |  |
Commitment fee percentage | 0.375% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  | 0.375% |  |  |  |  |  |  |  |
Debt instrument covenant, requirement leverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  | 5 |  |  | 1 | 5.50 |  |  |
Debt instrument covenant, requirement senior secured leverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  | 3.75 |  |  | 1 | 4.25 |  |  |
Debt instrument covenant, requirement interest coverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  | 2.75 |  |  | 1 | 3 |  |  |
Senior secured credit facility, amount outstanding |  |  | 500,000,000 |  | 63,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit, outstanding amount |  |  |  |  |  |  | 16,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date of debt | Jul. 25, 2017 |  |  |  |  |  |  |  | Feb. 15, 2021 |  |  | Dec. 15, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total amount available for borrowings, remaining borrowing capacity |  |  | 483,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount |  |  |  |  |  |  |  |  | $ 350,000,000 |  |  |  | $ 100,000,000 | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, stated rate |  |  |  |  |  |  |  |  |  |  |  |  | 7.875% | 7.875% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, percentage of face value |  |  |  |  |  |  |  |  |  | 101.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  |  |  |  |  |  |  |  |  | 7.682% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of principal, early debt redemption |  |  |  |  |  |  |  |  |  |  | 35.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earliest debt redemption date |  |  |  |  |  |  |  |  |  |  | Dec. 15, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of the redeemable value of debt on Face amount |  |  |  |  |  |  |  |  |  |  | 107.875% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Under the credit facility, the leverage ratio as defined cannot exceed this specified level. + References No definition available. + Details
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- Definition Under the credit facility, the senior secured leverage ratio as defined cannot exceed this specified level. + 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 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 Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + 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 Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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. + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph f -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 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a (1) -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 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 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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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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