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Cash and stock-based compensation plans (Details 3) (Stock Purchase Options [Member], USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Stock Purchase Options [Member]
      
Options Outstanding 915,566 1,142,019 803,994
Granted Options 182,420 72,053 420,777
Forfeited Options (231,639) (58,067) (646)
Exercised Options (442,675) (240,439) (82,106)
Options Outstanding 423,672 915,566 1,142,019
Exercisable Options 92,316    
Expected to vest Options 331,356    
Outstanding weighted average exercise price $ 12.87 $ 12.39 $ 11.58
Granted Weighted average exercise price $ 18.93 $ 17.81 $ 13.52
Forfeited Weighted average exercise price $ 15.82 $ 12.16 $ 15.43
Exercised Weighted average exercise price $ 12.9 $ 12.27 $ 10.15
Outstanding weighted average exercise price $ 13.83 $ 12.87 $ 12.39
Exercisable Weighted average exercise price $ 12.45    
Expected to vest Weighted average exercise price $ 14.22    
Outstanding Weighted Average remaining contractual term 4 years 1 month 24 days    
Exercisable Weighted Average remaining contractual term 2 years 1 month 13 days    
Expected to vest Weighted average remaining contractual term 4 years 5 months 5 days    
Outstanding Aggregate intrinsic value $ 3,273    
Exercisable Aggregate intrinsic value 841    
Expected to vest Aggregate intrinsic value $ 2,432