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Fair Value Measurement (Foreign Currency Forward Contracts) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Derivative [Line Items] |  |  |
Gains (losses) on intercompany receivables | $ (100) | $ (800) | $ (500)
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Derivative Asset, Fair Value, Gross Asset | 4,010 | 2,935 |
Derivative Liability, Fair Value, Gross Liability | (1,564) | (1,064) |
Fair value, assets (liabilities), net | 2,446 | 1,871 |
Foreign Exchange Contracts [Member] |  |  |
Derivative [Line Items] |  |  |
Forward contracts not designated as hedging instruments net realized gains (losses) | 0 | 400 | (200)
Designated as Hedging Instrument [Member] | Foreign Exchange Contracts [Member] | Prepaid Expenses and Other Current Assets [Member] |  |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Derivative Asset, Fair Value, Gross Asset | 3,962 | 2,931 |
Derivative Liability, Fair Value, Gross Liability | (1,510) | (1,026) |
Fair value, assets (liabilities), net | 2,452 | 1,905 |
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contracts [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount of cash flow hedges | 18,400 |  |
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contracts [Member] | Prepaid Expenses and Other Current Assets [Member] |  |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Derivative Asset, Fair Value, Gross Asset | 48 | 4 |
Derivative Liability, Fair Value, Gross Liability | (54) | (38) |
Fair value, assets (liabilities), net | (6) | (34) |
Cash Flow Hedging [Member] | Foreign Exchange Contracts [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount of cash flow hedges | 108,100 |  |
Cash flow hedges realized gains (losses) | 1,200 | $ 10,400 | $ 600
Unrealized gain (loss) on cash flow hedges in accumulated other comprehensive income (loss) expected to be recognized in next fiscal year | $ 1,500 |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References 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 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other 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 assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=64830801&loc=SL51823488-111719 + Details
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