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Derivatives and Hedging Activities (Schedule of Balance Sheet Classification and Fair Values of Derivative Instruments) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Derivatives, Fair Value [Line Items] |  |
Fair value | $ (450) | $ (568)
Notional amount | 130,423 | 100,873
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount of derivative asset | 89,100 |
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedge [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount of derivative asset | 41,300 | 13,200
Other current assets [Member] | Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value derivative asset | 374 | 90
Notional amount of derivative asset | 34,695 | 22,036
Other current assets [Member] | Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedge [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value derivative asset |  | 263
Notional amount of derivative asset |  | 13,169
Accrued expenses and other current liabilities [Member] | Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value derivative liability | (196) | (921)
Notional amount of derivative liability | 54,425 | 65,668
Accrued expenses and other current liabilities [Member] | Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedge [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value derivative liability | (628) |
Notional amount of derivative liability | $ 41,303 |

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