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Goodwill (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Schedule of Goodwill    
Goodwill, Balance as of January 1 $ 21,415 $ 21,415
Accumulated impairment losses - Data Processing (5,062) (4,681)
Impairment losses during the year - Data Processing    381
Goodwill, Balance as of December 31 21,415 21,415
Accumulated impairment losses (5,062) (5,062)
Goodwill $ 16,353 $ 16,353