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Goodwill and intangible assets (Estimated future amortization expense) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Goodwill and Intangible Assets Disclosure [Abstract]  
2012 $ 436
2013 727
2014 567
2015 389
2016 258
Thereafter 328
Total $ 2,705