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Intangible Assets (Expected Future Amortization) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, net $ 46,952 $ 48,969
Retailer Relationships [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Remainder of 2013 4,673  
2014 5,432  
2015 4,012  
2016 4,012  
2017 4,012  
2018 4,012  
Thereafter 14,096  
Intangible assets, net 40,249 41,826
Other [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Remainder of 2013 794  
2014 970  
2015 940  
2016 828  
2017 806  
2018 802  
Thereafter 1,563  
Intangible assets, net $ 6,703 $ 7,143