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Financial Instruments and Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 lb | Dec. 31, 2012 lb
Forward Contracts [Member] |  |  |  |
Derivatives designated as hedging instruments, Cash Flow Hedges: |  |  |  |
Derivatives Designated As Hedging Instruments Cash Flow Hedges Notional Amount | $ 69,250 | [1] | $ 36,500 | [1]
Derivatives not designated as hedging instruments: |  |  |  |
Notional amount of derivatives not designated as hedging instruments | 12,625 | [1] | 12,643 | [1]
Commodity Contract [Member] |  |  |  |
Derivatives designated as hedging instruments, Cash Flow Hedges: |  |  |  |
Fixed Price Commodity Contracts (in pounds) | 2,827,000 | [1] | 2,436,000 | [1]
Interest Rate Swap [Member] |  |  |  |
Derivatives designated as hedging instruments, Fair Value Hedge: |  |  |  |
Derivatives Designated As Hedging Instruments Fair Value Hedges Notional Amount | 45,000 | [1] | 45,000 | [1]
Other Assets [Member] | Forward Contracts [Member] |  |  |  |
Derivatives not designated as hedging instruments: |  |  |  |
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net | 0 |  | 0 |
Derivatives designated as hedging instruments, Cash Flow Hedges: |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net | 573 |  | 1,800 |
Other Assets [Member] | Commodity Contract [Member] |  |  |  |
Derivatives designated as hedging instruments, Cash Flow Hedges: |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net | 0 |  | 340 |
Other Assets [Member] | Interest Rate Swap [Member] |  |  |  |
Derivatives designated as hedging instruments, Fair Value Hedge: |  |  |  |
Interest Rate Fair Value Hedge Derivative at Fair Value, Net | 818 |  | 2,212 |
Other Liabilities [Member] | Forward Contracts [Member] |  |  |  |
Derivatives not designated as hedging instruments: |  |  |  |
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net | 16 |  | 191 |
Derivatives designated as hedging instruments, Cash Flow Hedges: |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net | 0 |  | 0 |
Other Liabilities [Member] | Commodity Contract [Member] |  |  |  |
Derivatives designated as hedging instruments, Cash Flow Hedges: |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net | 1,111 |  | 0 |
Other Liabilities [Member] | Interest Rate Swap [Member] |  |  |  |
Derivatives designated as hedging instruments, Fair Value Hedge: |  |  |  |
Interest Rate Fair Value Hedge Derivative at Fair Value, Net | $ 0 |  | $ 0 |
[1] | Notional amounts represent the gross contract / notional amount of the derivatives outstanding. The fixed price commodity notional amounts are in pounds.

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