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Hedge Contracts (Details) | 12 Months Ended |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2012 EUR (€) | Dec. 31, 2011 USD ($) | May 31, 2011 | Dec. 31, 2013 Current Assets [Member] USD ($) | Dec. 31, 2013 Current Liabilities [Member] USD ($) | Dec. 31, 2011 Oil Swap Contract [Member] USD ($) | Dec. 31, 2011 Natural Gas Swap Contract [Member] USD ($) | Dec. 31, 2013 Forward Sale Contract, Mexican Pesos [Member] USD ($) | Dec. 31, 2013 Forward Purchase Contract, Mexican Pesos [Member] USD ($) | Dec. 31, 2013 Forward Purchase Contract, Euros [Member] USD ($) | Dec. 31, 2013 Forward Purchase Contract, Pounds Sterling [Member] USD ($)
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Dollar notional amount |  |  |  |  |  |  |  |  |  | $ 10,332,000 | $ 5,928,000 | $ 7,984,000 | $ 3,149,000
Traded exchange rate |  |  |  |  |  |  |  |  |  | 13.01 | 13.01 | 1.38 | 1.63
Value date |  |  |  |  |  |  |  |  |  | Jan. 17, 2014 | Jan. 17, 2014 | Jan. 17, 2014 | Jan. 17, 2014
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of pretax gain reclassified from accumulated other comprehensive income into product sales revenue (effective portion) |  |  |  | 1,177,000 |  |  |  | 1,177,000 | 0 |  |  |  |
Amount of pretax gain (loss) from change in derivative fair value recognized in other comprehensive income |  |  |  | (7,854,000) |  |  |  | (7,854,000) | 0 |  |  |  |
Amount of pretax gain (loss) recognized in other income (expense) (ineffective portion) |  |  |  | (13,947,000) |  |  |  | (13,947,000) | 0 |  |  |  |
Net losses associated with foreign currency derivative program | 34,000 |  |  |  |  |  |  |  |  |  |  |  |
Cumulative translation adjustment for investment hedge, net of tax | 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of proved reserves sold as of May 31, 2011 |  |  |  |  | 79.00% |  |  |  |  |  |  |  |
Cash paid for liquidation of hedge contract |  |  |  | 14,200,000 |  |  |  |  |  |  |  |  |
Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Forward purchase contracts |  |  |  |  |  | 72,000 | (52,000) |  |  |  |  |  |
Forward sale contracts |  |  |  |  |  |  | 32,000 |  |  |  |  |  |
Total derivatives designated as hedging instruments | 52,000 |  |  |  |  |  |  |  |  |  |  |  |
Borrowings designated as a hedge of net investment in foreign subsidiary |  | $ 13,800,000 | € 10,000,000 |  |  |  |  |  |  |  |  |  |

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