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