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Acquisitions and Dispositions (Details 3) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Sportech Plc
Sep. 30, 2013
Racing Business
Oct. 31, 2010
Racing Business
Year
Dec. 31, 2010
Racing Business
Sep. 30, 2010
Racing Business
Oct. 05, 2010
Racing Business
Sportech Plc
Oct. 31, 2010
Racing Business
Sportech Plc
Maximum
Acquisitions                    
Cash received $ 0 $ 0 $ 35,942         $ 33,000    
Consideration received (in shares)                 39,742  
Percentage of voting interests acquired                   20.00%
Consideration received, percentage of investee 20.00%     20.00%            
Value of consideration received           26,300        
Additional cash consideration receivable (in dollars)         10,000          
Period for contigent consideration (in years)           3        
Contingent consideration cash receivable           8,000        
Write down of assets held for sale               8,029    
Loss on the sale of the racing business $ 0 $ 0 $ (8,390)       $ (361)