Fair Value Measurement (Foreign Currency Forward Contracts) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Derivative [Line Items]
Gains (losses) on intercompany receivables	$ 800,000	$ (300,000)	$ (700,000)
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Fair value, assets	457,000	5,083,000
Fair value, liabilities	(2,399,000)	(421,000)
Fair value, assets (liabilities), net	(1,942,000)	4,662,000
Foreign Currency Forward Contracts [Member]
Derivative [Line Items]
Notional amount of cash flow hedges	90,300,000
Cash flow hedges realized gains (losses)	3,800,000	(4,700,000)	2,000,000
Unrealized gain (loss) on cash flow hedges in accumulated other comprehensive income (loss) expected to be recognized in next fiscal year	(1,100,000)
Notional amount of forward contracts not designated as hedging instruments	47,300,000
Forward contracts not designated as hedging instruments net realized gains (losses)	(2,100,000)	0	300,000
Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Fair value, assets		5,042,000
Fair value, liabilities		(326,000)
Fair value, assets (liabilities), net		4,716,000
Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Other Current Liabilities [Member]
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Fair value, assets	457,000
Fair value, liabilities	(2,249,000)
Fair value, assets (liabilities), net	(1,792,000)
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Fair value, assets		41,000
Fair value, liabilities		(95,000)
Fair value, assets (liabilities), net		(54,000)
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Other Current Liabilities [Member]
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Fair value, assets	0
Fair value, liabilities	(150,000)
Fair value, assets (liabilities), net	$ (150,000)