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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Derivatives Fair Value      
Notional amounts of the forward contracts $ 20,000    
Foreign currency forward contracts gain 904 1,862 0
Equity interest in derivative instrument held by Lotterie Nazionali 20.00%    
Derivative financial instruments loss, net of tax 518    
Foreign currency forward contracts
     
Derivatives Fair Value      
Notional amounts of the forward contracts 20,000    
Foreign currency forward contracts gain 904    
Weighted-average fixed rate of forward exchange contract 1.2690    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign currency forward contracts | Accrued Liabilities
     
Derivatives Fair Value      
Fair value asset (liability) $ (1,013)