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Debt (Narrative) (Details) (USD $) | 12 Months Ended |  |  |  |  | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |  |
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Dec. 31, 2013 | Dec. 31, 2013 Letter Of Credit [Member] | Dec. 31, 2013 Senior Secured Credit Facility [Member] | Jul. 25, 2012 Senior Secured Credit Facility [Member] | Dec. 31, 2013 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, 2013 Senior Secured Credit Facility [Member] Letter Of Credit [Member] | Jul. 25, 2012 Senior Secured Credit Facility [Member] Accordion [Member] | Feb. 01, 2012 Senior Unsecured Notes [Member] | Dec. 31, 2013 Seven Point Eight Seventy Five Percentage Senior Unsecured Notes [Member] | Feb. 01, 2012 Seven Point Eight Seventy Five Percentage Senior Unsecured Notes [Member] | Nov. 30, 2010 Seven Point Eight Seventy Five Percentage Senior Unsecured Notes [Member] | Dec. 31, 2013 Federal Funds Effective Rate [Member] | Dec. 31, 2013 Eurodollar Rate [Member] | Dec. 31, 2013 Applicable Margin [Member] | Dec. 31, 2013 Five Point Seventy Five Percentage Senior Unsecured Notes [Member] | Feb. 08, 2013 Five Point Seventy Five Percentage Senior Unsecured Notes [Member] | Dec. 31, 2013 CHOPS [Member] | Dec. 31, 2013 Maximum [Member] | Dec. 31, 2013 Maximum [Member] Senior Secured Credit Facility [Member] | Dec. 31, 2013 Maximum [Member] Senior Secured Credit Facility [Member] Letter Of Credit [Member] | Dec. 31, 2013 Maximum [Member] Federal Funds Effective Rate [Member] | Dec. 31, 2013 Maximum [Member] LIBOR Rate [Member] | Dec. 31, 2013 Maximum [Member] Eurodollar Rate [Member] | Dec. 31, 2013 Maximum [Member] Alternate Base Rate [Member] | Dec. 31, 2013 Minimum [Member] | Dec. 31, 2013 Minimum [Member] Senior Secured Credit Facility [Member] | Dec. 31, 2013 Minimum [Member] Eurodollar Rate [Member] | Dec. 31, 2013 Minimum [Member] Alternate Base Rate [Member] | Dec. 31, 2013 During Acquisition Period [Member] Maximum [Member] Senior Secured Credit Facility [Member] | Dec. 31, 2013 During Acquisition Period [Member] Minimum [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] | Dec. 31, 2013 Amended Facility [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior secured credit facility, maximum borrowing capacity |  |  |  | $ 775,000,000 |  | $ 125,000,000 |  | $ 225,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000 | $ 300,000,000 | $ 1,000,000,000
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00 |  |  |  |  |  |  | 5.00 |  |  | 1.00 | 5.50 |  |  |
Debt instrument covenant, requirement senior secured leverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00 |  |  |  |  |  |  | 3.75 |  |  | 1.00 | 4.25 |  |  |
Debt instrument covenant, requirement interest coverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00 |  |  |  |  |  |  | 3.00 |  |  | 1.00 | 2.75 |  |  |
Senior secured credit facility, amount outstanding |  |  | 582,800,000 |  | 80,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit, outstanding amount |  |  |  |  |  |  | 11,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date of debt |  |  |  |  |  |  | Jul. 25, 2017 |  |  | Dec. 15, 2018 |  |  |  |  |  | Feb. 15, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total amount available for borrowings, remaining borrowing capacity |  |  | 405,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount |  |  |  |  |  |  |  |  | $ 350,000,000 |  | $ 100,000,000 | $ 250,000,000 |  |  |  |  | $ 350,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, stated rate |  |  |  |  |  |  |  |  |  |  |  | 7.875% |  |  |  |  | 5.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, percentage of face value |  |  |  |  |  |  |  |  | 101.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  |  |  |  |  |  |  |  | 7.682% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of principal, early debt redemption |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of the redeemable value of debt on Face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 105.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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 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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