Quarterly report pursuant to Section 13 or 15(d)

Capital Transactions (Details 2)

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Capital Transactions (Details 2) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Stock options
         
Number of shares          
Options outstanding at the beginning of the period (in shares)     1,784    
Granted (in shares)     623    
Forfeited (in shares)     (35)    
Exercised (in shares)     (149)    
Options outstanding at the end of the period (in shares) 2,223   2,223    
Weighted Average Exercise Price Per Share          
Options outstanding at the beginning of the period (in dollars per share)     $ 11.81    
Granted (in dollars per share)     $ 15.01    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price     $ 14.67    
Exercised (in dollars per share)     $ 9.11    
Options outstanding at the end of the period (in dollars per share) $ 12.84   $ 12.84    
Stock options | Maximum
         
Weighted-average assumptions used to calculate fair value of options granted          
Expected life     6 years    
Risk-free interest rate (as a percent)     0.80%    
Expected volatility (as a percent)     58.10%    
Dividend yield (as a percent)     2.70%    
Stock options | Minimum
         
Weighted-average assumptions used to calculate fair value of options granted          
Expected life     5 years    
Risk-free interest rate (as a percent)     0.60%    
Expected volatility (as a percent)     56.10%    
Dividend yield (as a percent)     2.60%    
Time-based stock options
         
Share-based compensation, related information          
Share-based compensation expense $ 729 $ 356 $ 1,803 $ 669  
Related tax benefits 288 142 712 267  
Unrecognized share-based compensation expense 4,023   4,023   2,715
Weighted-average period over which the remaining compensation expense is expected to be recognized     2 years    
Time-based stock options | Maximum
         
Share-based compensation, additional disclosures          
Vesting period     48 months    
Performance based stock options
         
Share-based compensation, related information          
Share-based compensation expense 0 329 0 652  
Related tax benefits 0 127 0 255  
Unrecognized share-based compensation expense         0
Performance based stock options operating income margins
         
Share-based compensation, additional disclosures          
Operating income margin, one (as a percent)     6.00%    
Operating income margin, two (as a percent)     8.00%    
Operating income margin, three (as a percent)     10.00%    
Period of time during which operating income margins must be achieved in order to vest in performance based stock options     12 months    
Consecutive period of time used to assess operating income margins which determine vesting     15 months    
Performance based stock options sales and operating income margins
         
Share-based compensation, additional disclosures          
Vesting period     2 years    
Operating income margin, two (as a percent)     8.00%    
Performance based stock options sales
         
Share-based compensation, additional disclosures          
Vesting period based on achieving annual net sales targets     1 year    
Performance based stock options sales | Maximum
         
Share-based compensation, related information          
Potential compensation expense $ 1,070   $ 1,070    
2012 Stock Incentive Plan | Stock options
         
Number of shares          
Granted (in shares)     623    
Weighted Average Exercise Price Per Share          
Granted (in dollars per share)     $ 15.01    
Share-based compensation, additional disclosures          
Weighted-average grant date fair value (in dollars per share)     $ 6.15    
Expiration period     10 years