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3. Foreign Exchange Forward Contracts (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Contracts maturing in April through June 2013 to sell foreign currency  
Notional value $ 76.6
Unrealized gain 0.2
Contracts maturing in April through June 2013 to purchase foreign currency  
Notional value 385.1
Unrealized gain $ 0.7