Forward and Option Purchase Contracts Outstanding (Details) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012 Currency, British Pound Sterling Derivative Instrument 1 GBP (£)	Jun. 30, 2012 Currency, British Pound Sterling Derivative Instrument 2 GBP (£)	Jun. 30, 2012 Currency, British Pound Sterling Derivative Instrument 3 GBP (£)	Jun. 30, 2012 Currency, Canadian Dollar CAD	Jun. 30, 2012 Currency, Euro EUR (€)	Jun. 30, 2012 Currency, Euro Derivative Instrument 1 EUR (€)	Jun. 30, 2012 Currency, Euro Derivative Instrument 2 EUR (€)	Jun. 30, 2012 Currency, Mexican Peso MXN	Jun. 30, 2012 Currency, U.S. Dollar Derivative Instrument 1 USD ($)	Jun. 30, 2012 Currency, U.S. Dollar Derivative Instrument 2 USD ($)	Jun. 30, 2012 Currency, U.S. Dollar Derivative Instrument 3 USD ($)	Jun. 30, 2012 Currency, U.S. Dollar Derivative Instrument 4 USD ($)
Derivative [Line Items]
Forward contracts to purchase						€ 18,537,000	€ 12,461,000		$ 4,641,000	$ 3,860,000	$ 37,290,000	$ 1,452,000
Forward contracts to sell	£ 15,000,000	£ 10,000,000	£ 3,000,000	4,000,000	€ 30,000,000			20,000,000
Maturity	Sep. 28, 2012	Sep. 28, 2012	Sep. 28, 2012	Sep. 28, 2012	Sep. 28, 2012	Sep. 28, 2012	Sep. 28, 2012	Sep. 28, 2012	Sep. 28, 2012	Sep. 28, 2012	Sep. 28, 2012	Sep. 28, 2012