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Commitments and Contingencies (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Loss Contingencies [Line Items] |  |  |  |
Environmental Remediation Expense | $ 4,100,000 |  |  |
Maximum Exposure for Environmental Remediation under Omnibus Agreement | 250,000 |  |  |
Recorded Related Party Environmental Recoveries Receivable | 3,850,000 |  | 3,850,000 |
Environmental Recoveries Reimbursed under Omnibus Agreement |  |  | 750,000 |
Letters of Credit Outstanding, Amount | 11,500,000 |  | 11,500,000 |
Operating Leases, Rent Expense | 100,000 | 100,000 | 200,000 | 200,000
Operating Leases, rent expense, Related Party | $ 0 |  |  |
East Houston Contract [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Maximum Purchases under Supply Contract |  |  | 7,000 |
Abilene Contract [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Maximum Purchases under Supply Contract |  |  | 20,350 |

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- Definition The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859 + Details
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