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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, 2011 | Dec. 31, 2010 | Dec. 31, 2011 Letter Of Credit [Member] | Dec. 31, 2011 Senior Secured Credit Facility [Member] | Aug. 31, 2011 Senior Secured Credit Facility [Member] | Dec. 31, 2011 Senior Secured Credit Facility [Member] Crude Oil And Petroleum Products Inventory [Member] | Aug. 31, 2011 Senior Secured Credit Facility [Member] Crude Oil And Petroleum Products Inventory [Member] | Dec. 31, 2011 Senior Secured Credit Facility [Member] Letter Of Credit [Member] | Aug. 31, 2011 Senior Secured Credit Facility [Member] Accordion [Member] | Feb. 01, 2012 Senior Unsecured Notes [Member] | Dec. 31, 2011 Senior Unsecured Notes [Member] | Dec. 31, 2010 Senior Unsecured Notes [Member] | Dec. 31, 2011 7.875% Senior Unsecured Notes [Member] | Dec. 31, 2010 7.875% Senior Unsecured Notes [Member] | Nov. 30, 2010 7.875% Senior Unsecured Notes [Member] | Dec. 31, 2011 Federal Funds Effective Rate [Member] | Dec. 31, 2011 Eurodollar Rate [Member] | Dec. 31, 2011 Applicable Margin [Member] | Nov. 30, 2010 CHOPS [Member] | Jul. 31, 2010 DG Marine [Member] | Dec. 31, 2011 Maximum [Member] | Dec. 31, 2011 Maximum [Member] Letter Of Credit [Member] | Dec. 31, 2011 Maximum [Member] Senior Secured Credit Facility [Member] Letter Of Credit [Member] | Aug. 19, 2011 Maximum [Member] Alternate Base Rate [Member] | Aug. 19, 2011 Maximum [Member] Eurodollar Rate [Member] | Dec. 31, 2011 Minimum [Member] | Dec. 31, 2011 Minimum [Member] Letter Of Credit [Member] | Aug. 19, 2011 Minimum [Member] Alternate Base Rate [Member] | Aug. 19, 2011 Minimum [Member] Eurodollar Rate [Member] | Dec. 31, 2011 During Acquisition Period [Member] Senior Secured Credit Facility [Member] | Aug. 31, 2011 Amended Facility [Member] Senior Secured Credit Facility [Member] | Aug. 31, 2011 Amended Facility [Member] Senior Secured Credit Facility [Member] Crude Oil And Petroleum Products Inventory [Member] | Aug. 31, 2011 Amended Facility [Member] Senior Secured Credit Facility [Member] Accordion [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of senior unsecured notes |  |  |  |  |  |  |  |  |  |  | $ 253,100,000 | $ 250,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior secured credit facility, maximum borrowing capacity |  |  |  |  | 525,000,000 |  | 75,000,000 |  | 125,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 775,000,000 | 125,000,000 | 225,000,000
Line of credit facility, aggregate maximum borrowing capacity |  |  |  |  | 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total amount available for borrowings, remaining borrowing capacity |  |  |  | 356,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior secured credit facility, amount outstanding |  |  |  | 409,300,000 |  | 69,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit, outstanding amount |  |  |  |  |  |  |  | 9,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |
Maturity date of debt |  | Jun. 30, 2015 |  |  |  |  |  |  |  |  |  |  |  | Dec. 15, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spreads senior secured credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% | 2.50% | 1.50% |  |  |  |  |  | 2.00% | 3.00% |  |  | 1.00% | 2.00% |  |  |  |
Letter of credit, fee percentage |  |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.50% |  |  |  |  | 2.50% |  |  |  |  |  |
Commitment fee percentage | 0.375% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% |  |  |  |  | 0.375% |  |  |  |  |  |  |
Financing costs deferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 775.000 |  |  |  |  |  |  |
Debt instrument covenant, requirement leverage ratio |  |  |  | 5.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.50 |  |  |
Debt instrument covenant, requirement senior secured leverage ratio |  |  |  | 3.75 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.25 |  |  |
Debt instrument covenant, requirement interest coverage ratio |  |  |  | 2.75 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00 |  |  |
Debt instrument, principal amount |  |  |  |  |  |  |  |  |  | $ 100,000,000 |  |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, stated rate |  |  |  |  |  |  |  |  |  |  | 7.875% |  | 7.875% |  | 7.875% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% | 49.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of principal, early debt redemption |  |  |  |  |  |  |  |  |  |  |  |  | 35.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of the redeemable value of debt on Face amount |  |  |  |  |  |  |  |  |  |  |  |  | 107.875% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earliest debt redemption date |  |  |  |  |  |  |  |  |  |  |  |  | December 15, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Under the credit facility, the interest coverage ratio as defined must exceed this specified level. + References No definition available. + Details
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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 Date at which all of the notes can be redeemed subject to premiums. + References No definition available. + Details
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- Definition The annual rate paid for the use of letters of credit. + References No definition available. + Details
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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 The percentage points added to the reference rate to compute the variable rate on the debt instrument. + 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 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. Reference 2: 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 3: 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 Date when the debt instrument is scheduled to be fully repaid, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.). + 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 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)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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 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. Reference 3: 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 + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 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 + 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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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition The cash outflow for loan and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18, 19, 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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 + Details
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