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Business Segment Information - Major Customers (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales | $ 1,338,098 | $ 532,798 | $ 478,434 | $ 381,635 | $ 373,838 | $ 363,753 | $ 364,774 | $ 312,848 | $ 2,730,965 | $ 1,415,213 | $ 931,736
Occidental Petroleum Corporation |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 829,081 |  |
% of Revenue |  |  |  |  |  |  |  |  | 30.40% |  |
Plains Marketing, L.P. |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 426,339 | 276,285 | 239,396
% of Revenue |  |  |  |  |  |  |  |  | 15.60% | 19.50% | 25.70%
Enterprise Crude Oil Llc |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 394,162 | 319,277 |
% of Revenue |  |  |  |  |  |  |  |  | 14.40% | 22.60% |
Conoco Phillips Company |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  |  | $ 109,358
% of Revenue |  |  |  |  |  |  |  |  |  |  | 11.70%

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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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