Fair Value Measurement (Foreign Currency Forward Contracts) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Derivative [Line Items]
Gains (losses) on intercompany receivables	$ (300,000)	$ (700,000)	$ 4,600,000
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Fair value, assets	5,083,000
Fair value, liabilities	(421,000)
Fair value, assets (liabilities), net	4,662,000
Foreign Currency Forward Contracts [Member]
Derivative [Line Items]
Notional amount of cash flow hedges	114,300,000
Cash flow hedges realized gains (losses)	(4,700,000)	2,000,000	(400,000)
Unrealized gain (loss) on cash flow hedges in accumulated other comprehensive income (loss) expected to be recognized in 2012	3,000,000
Notional amount of forward contracts not designated as hedging instruments	46,800,000
Forward contracts not designated as hedging instruments net realized gains (losses)	0	300,000	(3,900,000)
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
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)