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Fair Value Measurements and Derivative Instruments (Derivative Instruments) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Derivative [Line Items] |  |
Total net derivative liability | $ (3,671) | $ (1,602)
Total derivative assets |  |
Derivative [Line Items] |  |
Derivative asset | 1,716 | 1,386
Total derivative liabilities |  |
Derivative [Line Items] |  |
Derivative liability | (5,387) | (2,988)
Derivatives designated as hedging instruments | Foreign exchange contracts | Other current assets and prepayments |  |
Derivative [Line Items] |  |
Derivative asset | 217 | 762
Derivatives designated as hedging instruments | Foreign exchange contracts | Accounts payable and accrued liabilities |  |
Derivative [Line Items] |  |
Derivative liability | (208) | 0
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other current assets and prepayments |  |
Derivative [Line Items] |  |
Derivative asset | 1,499 | 624
Derivatives not designated as hedging instruments | Foreign exchange contracts | Accounts payable and accrued liabilities |  |
Derivative [Line Items] |  |
Derivative liability | $ (5,179) | $ (2,988)

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