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Summary of Significant Accounting Policies (Details 3) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Derivative Financial Instruments  
Period for which certain forecasted foreign currency rent and salary payments are hedged 12 months
Notional amount of outstanding foreign currency forward contracts and options $ 13.0
Net fair value balance of outstanding foreign currency forward contracts 0.4
Fair value asset balance of outstanding foreign currency forward contracts 0.5
Fair value liability balance of outstanding foreign currency forward contracts 0.1
Period expected to be recognized in results of operations 12 months
Loss on hedging activities 0.6
Loss on hedging activities included in operating expenses 0.5
Loss on hedging activities included in other expense 0.1
Cash in banks with counterparty $ 1.6