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Derivatives and Hedging Activities (Narrative) (Details)
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12 Months Ended | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2014
USD ($)
|
Dec. 31, 2013
USD ($)
|
Dec. 31, 2012
USD ($)
|
Dec. 31, 2014
Foreign Exchange Contract [Member]
Other current assets [Member]
Designated as Hedging Instrument [Member]
Cash Flow Hedge [Member]
USD ($)
|
Dec. 31, 2013
Foreign Exchange Contract [Member]
Other current assets [Member]
Designated as Hedging Instrument [Member]
Cash Flow Hedge [Member]
USD ($)
|
Dec. 31, 2014
Foreign Exchange Contract [Member]
Other current assets [Member]
Not Designated as Hedging Instrument [Member]
USD ($)
|
Dec. 31, 2014
Foreign Exchange Contract [Member]
Other current assets [Member]
Not Designated as Hedging Instrument [Member]
EUR (€)
|
Dec. 31, 2013
Foreign Exchange Contract [Member]
Other current assets [Member]
Not Designated as Hedging Instrument [Member]
USD ($)
|
Dec. 31, 2014
Foreign Exchange Contract [Member]
Accrued expenses and other current liabilities [Member]
Designated as Hedging Instrument [Member]
Cash Flow Hedge [Member]
USD ($)
|
Dec. 31, 2013
Foreign Exchange Contract [Member]
Accrued expenses and other current liabilities [Member]
Designated as Hedging Instrument [Member]
Cash Flow Hedge [Member]
USD ($)
|
Dec. 31, 2014
Foreign Exchange Contract [Member]
Accrued expenses and other current liabilities [Member]
Not Designated as Hedging Instrument [Member]
USD ($)
|
Dec. 31, 2014
Foreign Exchange Contract [Member]
Accrued expenses and other current liabilities [Member]
Not Designated as Hedging Instrument [Member]
ILS
|
Dec. 31, 2013
Foreign Exchange Contract [Member]
Accrued expenses and other current liabilities [Member]
Not Designated as Hedging Instrument [Member]
USD ($)
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| Derivatives, Fair Value [Line Items] | |||||||||||||
| Assets derivatives - Notional amount | $ 5,760,000 | $ 45,000,000 | € 33,900,000 | $ 12,490,000 | |||||||||
| Liability derivatives - Notional amount | 38,426,000 | 18,424,000 | 66,300,000 | 54,000,000 | |||||||||
| Gain (loss) on derivative instrument | 4,400,000 | 4,400,000 | |||||||||||
| Fair value adjustments on derivatives designated as cash flow hedges | $ (1,396,000) | $ 153,000 | |||||||||||