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Goodwill (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Schedule of Goodwill    
Goodwill, Balance as of January 1 $ 16,353us-gaap_GoodwillGross $ 21,415us-gaap_GoodwillGross
Accumulated impairment losses - Data Processing (5,062)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss (5,062)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Goodwill, Balance as of December 31 $ 16,353us-gaap_GoodwillGross $ 21,415us-gaap_GoodwillGross