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Derivatives and Hedging Activities (Fair Value Balance Sheet Disclosures) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Not Designated as a Hedging Instrument | Forward Exchange Contracts    
Fair value disclosues, by balance sheet location    
Current derivative assets $ 2,364 $ 11,709
Noncurrent derivative assets 0 6
Current derivative liabilities 3,196 6,168
Noncurrent derivative liabilities 441 348
Designated as Hedging Instrument | Interest Rates Swaps and Forward Exchange Contracts    
Fair value disclosues, by balance sheet location    
Current derivative assets 26 0
Current derivative liabilities 1,448 6,952
Noncurrent derivative liabilities $ 0 $ 411