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Fair Value Measurement (Foreign Currency Forward Contracts) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Derivative [Line Items] |  |  |
Gains (losses) on intercompany receivables | $ (800) | $ 1,100 | $ (100)
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 | 5,836 |  |
Derivative Liability, Fair Value, Gross Liability | (648) |  |
Fair value, assets (liabilities), net | 5,188 |  |
Other Current Liabilities |  |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 350 |
Derivative Liability, Fair Value, Gross Liability |  | (6,023) |
Fair value, assets (liabilities), net |  | (5,673) |
Foreign Exchange Forward [Member] |  |  |
Derivative [Line Items] |  |  |
Forward contracts not designated as hedging instruments net realized gains (losses) | 100 | (1,600) | 0
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount of cash flow hedges | 155,300 |  |
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 | 5,817 |  |
Derivative Liability, Fair Value, Gross Liability | (431) |  |
Fair value, assets (liabilities), net | 5,386 |  |
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Other Current Liabilities |  |  |
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 | 19 |  |
Derivative Liability, Fair Value, Gross Liability | (217) |  |
Fair value, assets (liabilities), net | (198) |  |
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Other Current Liabilities |  |  |
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) | (900) | $ (700) | $ 1,200
Unrealized gain (loss) on cash flow hedges in accumulated other comprehensive income (loss) expected to be recognized in next fiscal year | 4,100 |  |
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount of cash flow hedges | $ 39,600 |  |

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