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Fair Value Measurements Fair Value Measurements Methods and Assumptions (Details) | 6 Months Ended
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Jun. 30, 2013
Cash, Cash Equivalents and Restricted Cash [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Fair Value Measurements, Valuation Techniques | The carrying amount is equal to fair market value
Energy Related Derivative [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Fair Value Measurements, Valuation Techniques | The fair value of diesel fuel contracts is determined by a mark-to-market valuation which estimates fair value by discounting the difference between the contracted forward price and the current forward price for the residual maturity of the contract.
Borrowings [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Fair Value Measurements, Valuation Techniques | The fair value of fixed rate debt is based upon quoted market prices for debt with similar terms and maturities.
Interest Rate Swap [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Fair Value Measurements, Valuation Techniques | The fair value of interest rate contracts is determined by discounting the expected future cash flows, for each instrument, at prevailing interest rates.
Foreign Exchange Contract [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Fair Value Measurements, Valuation Techniques | The fair value of foreign currency exchange contracts is determined by a mark-to-market valuation which estimates fair value by discounting the difference between the contracted forward price and the current forward price for the residual maturity of the contract using a risk-free interest rate.
Foreign Exchange Option [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Fair Value Measurements, Valuation Techniques | The fair value of foreign currency options contracts is based on a mark-to-market calculation using the Black-Scholes option pricing model.

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- Definition Description of the inputs and valuation technique(s) used to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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