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Derivative Instruments and Hedging Activities (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Derivative [Line Items] |  |  |  |  |
Maturity period |  |  |  | 7 months |
Derivatives not designated as hedging instruments |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Total non-designated derivative realized loss (gain), net |  | $ (2,492,000) | $ (693,000) | $ (4,860,000) | $ (421,000)
Derivatives not designated as hedging instruments | Commodity options |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount |  | 3,240,000 |  | 3,240,000 |
Total non-designated derivative realized loss (gain), net |  | 37,000 | (153,000) | 392,000 | 119,000
Derivatives not designated as hedging instruments | Foreign exchange forwards |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount |  | 5,709,000 |  | 5,709,000 |
Total non-designated derivative realized loss (gain), net |  | 114,000 | (237,000) | 208,000 | (237,000)
Derivatives not designated as hedging instruments | Foreign exchange options |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount |  | 30,000,000 |  | 30,000,000 |
Total non-designated derivative realized loss (gain), net |  | $ (2,643,000) | $ (303,000) | (5,460,000) | $ (303,000)
Cash Flow Hedges | Derivatives not designated as hedging instruments | Foreign exchange options |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Total non-designated derivative realized loss (gain), net | [1] |  |  | $ 182,000 |
[1] | Includes a loss of $182,000 from the first quarter of 2015 for the discontinuation of cash flow hedges for which the forecasted transactions are not expected to occur within the originally forecasted time frame.

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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