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

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-Publisher SEC
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-Number 210
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