Derivatives and Hedging Activities (Schedule of Balance Sheet Classification and Fair Values of Derivative Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Fair value	$ 1,368	$ 326
Notional amount	69,137	106,004
Foreign Exchange Contract [Member] \| Not Designated as Hedging Instrument [Member] \| Euro Member
Derivatives, Fair Value [Line Items]
Notional amount	33,300
Foreign Exchange Contract [Member] \| Not Designated as Hedging Instrument [Member] \| NIS [Member]
Derivatives, Fair Value [Line Items]
Notional amount	8,900
Foreign Exchange Contract [Member] \| Not Designated as Hedging Instrument [Member] \| Japanese, Yen [Member]
Derivatives, Fair Value [Line Items]
Notional amount	11,100
Foreign Exchange Contract [Member] \| Designated as Hedging Instrument [Member] \| Cash Flow Hedge [Member]
Derivatives, Fair Value [Line Items]
Notional amount	15,900	16,400
Other current assets [Member] \| Foreign Exchange Contract [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Fair value derivative asset	1,440	866
Notional amount of derivative asset	39,982	54,586
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	37	23
Notional amount of derivative asset	8,348	2,700
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	(48)	(432)
Notional amount of derivative liability	13,273	35,036
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	(61)	(131)
Notional amount of derivative liability	$ 7,534	$ 13,682

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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

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Nominal or face amount used to calculate payments on the derivative asset.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
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-Publisher FASB
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Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Nominal or face amount used to calculate payments on the derivative liability.

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