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Goodwill and intangible assets Future amortization schedule (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Goodwill and intangible assets [Abstract]  
Finite-Lived Intangibles, AmortExp, Rest of FY $ 216
Finite-Lived Intangibles, AmortExp Next Twelve Months-Yr 1 727
Finite-Lived Intangibles, AmortExp, Year Two 567
Finite-Lived Intangibles, AmortExp, Year Three 389
Finite-Lived Intangibles, AmortExp, Year Four 258
Finite-Lived Intangibles, AmortExp, Year Five 156
Finite-Lived Intangibles, AmortExp, after Year Five 172
Finite-Lived Intangible Assets, Net $ 2,485