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Derivative Instruments and Hedging Activities (Fair Value of Derivatives) (Details) (Derivatives not designated as hedging instruments, USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Derivative Asset	$ 5,765	$ 3,049
Commodity options \| Other current assets
Derivatives, Fair Value [Line Items]
Derivative Asset	311	591
Commodity options \| Other assets
Derivatives, Fair Value [Line Items]
Derivative Asset	0	162
Foreign exchange options \| Other current assets
Derivatives, Fair Value [Line Items]
Derivative Asset	5,454	1,851
Foreign exchange options \| Other assets
Derivatives, Fair Value [Line Items]
Derivative Asset	$ 0	$ 445

Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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