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Cash and stock-based compensation plans (Details 4) (Stock Purchase Options [Member], USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Stock Purchase Options [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options Outstanding 423,672 915,566 1,142,019
Granted Options 0 182,420 72,053
Forfeited Options (9,780) (231,639) (58,067)
Exercised Options (226,147) (442,675) (240,439)
Options Outstanding 187,745 423,672 915,566
Exercisable Options 53,994    
Expected to vest Options 133,751    
Outstanding weighted average exercise price $ 13.83 $ 12.87 $ 12.39
Granted Weighted average exercise price $ 0 $ 18.93 $ 17.81
Forfeited Weighted average exercise price $ 18.18 $ 15.82 $ 12.16
Exercised Weighted average exercise price $ 12.76 $ 12.90 $ 12.27
Outstanding weighted average exercise price $ 14.90 $ 13.83 $ 12.87
Exercisable Weighted average exercise price $ 11.58    
Expected to vest Weighted average exercise price $ 16.24    
Outstanding Weighted Average remaining contractual term 3 years 7 months 24 days    
Exercisable Weighted Average remaining contractual term 1 year 1 month 13 days    
Expected to vest Weighted average remaining contractual term 4 years 1 month 2 days    
Outstanding Aggregate intrinsic value $ 2,464    
Exercisable Aggregate intrinsic value 888    
Expected to vest Aggregate intrinsic value $ 1,576