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Pension benefits (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Amortization of transition obligation $ 90 $ 89 $ 91
Actuarial loss (228) (373) (379)
Total (138) (284) (288)
Amounts in accumulated other comprehensive income (loss) not yet reflected in net periodic pension cost, net of taxes:      
Actuarial gain 173 401  
Transition obligation (216) (306)  
Total (43) 95  
Amounts in accumulated other comprehensive income (loss) expected to be amortized in 2013 net periodic pension cost, net of taxes:      
Actuarial loss 329    
Transition obligation 84    
Total $ 413