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Fair Value Measurement (Foreign Currency Forward Contracts) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Derivative [Line Items] |  |  |
Gains (losses) on intercompany receivables | $ 1,100 | $ (100) | $ (800)
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Derivative Asset, Fair Value, Gross Asset | 350 | 4,010 |
Derivative Liability, Fair Value, Gross Liability | (6,023) | (1,564) |
Fair value, assets (liabilities), net | (5,673) | 2,446 |
Foreign Exchange Forward [Member] |  |  |
Derivative [Line Items] |  |  |
Forward contracts not designated as hedging instruments net realized gains (losses) | (1,600) | 0 | 400
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount of cash flow hedges | 126,000 |  |
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [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 |
Derivative Liability, Fair Value, Gross Liability |  | (1,510) |
Fair value, assets (liabilities), net |  | 2,452 |
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Other Current Liabilities [Member] |  |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Derivative Asset, Fair Value, Gross Asset | 346 |  |
Derivative Liability, Fair Value, Gross Liability | (5,945) |  |
Fair value, assets (liabilities), net | (5,599) |  |
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [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 |
Derivative Liability, Fair Value, Gross Liability |  | (54) |
Fair value, assets (liabilities), net |  | (6) |
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Other Current Liabilities [Member] |  |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Derivative Asset, Fair Value, Gross Asset | 4 |  |
Derivative Liability, Fair Value, Gross Liability | (78) |  |
Fair value, assets (liabilities), net | (74) |  |
Cash Flow Hedging [Member] | Foreign Exchange Forward [Member] |  |  |
Derivative [Line Items] |  |  |
Cash flow hedges realized gains (losses) | (700) | $ 1,200 | $ 10,400
Unrealized gain (loss) on cash flow hedges in accumulated other comprehensive income (loss) expected to be recognized in next fiscal year | (3,500) |  |
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount of cash flow hedges | $ 30,400 |  |

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