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Business Segment Information - Major Customers (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales | $ 143,642 | $ 180,152 | $ 229,607 | $ 215,308 | $ 346,881 | $ 394,107 | $ 374,714 | $ 443,056 | $ 768,709 | $ 1,558,758 | $ 1,983,388
Plains Marketing, L.P. |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | $ 318,018 | $ 597,117 | $ 491,258
Percentage of revenue |  |  |  |  |  |  |  |  | 41.40% | 38.30% | 24.80%
Shell Trading (US) Company |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  |  | $ 347,422
Percentage of revenue |  |  |  |  |  |  |  |  |  |  | 17.50%
Targa Pipeline Mid-Continent West OK LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | $ 231,649 | $ 333,027 | $ 211,838
Percentage of revenue |  |  |  |  |  |  |  |  | 30.10% | 21.40% | 10.70%

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