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Identifiable intangible assets (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]          
Software costs capitalized $ 871,000 $ 1,952,000 $ 2,493,000 $ 7,048,000  
Remaining estimated economic life of the product     3 years    
Amortization of capitalized software costs 402,000 112,000 1,166,000 395,000  
Amortization of identifiable intangible assets 138,000 257,000 441,000 667,000  
Components of identifiable intangible assets [Abstract]          
Intangible assets - gross 27,703   27,703   25,211
Less accumulated amortization (10,924)   (10,924)   (9,323)
Intangible assets - net 16,779   16,779   15,888
Future amortization of intangible assets assuming straight-line amortization of capitalized software costs [Abstract]          
2012 411   411    
2013 2,584   2,584    
2014 2,560   2,560    
2015 2,268   2,268    
2016 2,266   2,266    
Thereafter 4,590   4,590    
Total 14,679   14,679    
Acquired and internally developed software costs [Member]
         
Components of identifiable intangible assets [Abstract]          
Intangible assets - gross 20,394   20,394   17,902
Customer relationships [Member]
         
Components of identifiable intangible assets [Abstract]          
Intangible assets - gross 4,519   4,519   4,519
Trademarks (non-amortizable) [Member]
         
Components of identifiable intangible assets [Abstract]          
Intangible assets - gross 2,100   2,100   2,100
Other [Member]
         
Components of identifiable intangible assets [Abstract]          
Intangible assets - gross $ 690   $ 690   $ 690