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Goodwill and intangible assets Future amortization schedule (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Goodwill and intangible assets [Abstract]    
2014 $ 567  
2015 389  
2016 258  
2017 156  
2018 106  
Thereafter 68  
Finite-Lived Intangible Assets, Net $ 1,544 $ 2,267