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3. Foreign Exchange Forward Contracts (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Contracts maturing in April through June 2012 to sell foreign currency  
Notional value $ 49.8
Unrealized loss 0
Contracts maturing in April through June 2012 to purchase foreign currency  
Notional value 345.1
Unrealized loss $ 0.3