Quarterly report pursuant to Section 13 or 15(d)

Share-Based Payments - Stock Option Activity (Details)

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Share-Based Payments - Stock Option Activity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 1,536 $ 1,517 $ 3,094 $ 3,123
Employee Stock Option [Member]
        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 324 596 747 1,418
Tax benefit related to share-based expense 122 164 258 378
Unrecognized share-based compensation, net of estimated forfeitures 2,164 2,669 2,164 2,669
Employee activity - stock options [Abstract]        
Stock option grants expire (in years)     7 years  
Grants, vesting period (in years)     3 years  
Expected dividend yield (in hundredths)     1.20% 0.90%
Expected stock price volatility     43.70% 46.60%
Weighted Average Risk Free Interest Rate     0.90% 0.80%
Expected life of options (in years)     5 years 3 months 11 days 4 years 2 months 11 days
Weighted-average fair value of options (dollars per share)     $ 13 $ 13
Outstanding, beginning of period (in shares) 2,261,000   2,874,000  
Granted (in shares) 0   108,000  
Exercised (in shares) (359,000)   (1,080,000)  
Forfeited (in shares) 0   0  
Outstanding, end of period (in shares) 1,902,000   1,902,000  
Exercisable, end of period (in shares) 1,692,000   1,692,000  
Outstanding, beginning of period (in dollars per share) $ 27   $ 26  
Grants in Period (in dollars per share) $ 0   $ 37  
Exercises in Period (in dollars per share) $ 29   $ 26  
Forfeited in period (in dollars per share) $ 0   $ 0  
Outstanding, end of period (in dollars per share) $ 27   $ 27  
Exercisable, end of period (in dollars per share) $ 26   $ 26  
Aggregate Intrinsic Value Outstanding, end of period 20,296   20,296  
Aggregate Intrinsic Value Exercisable, end of period $ 19,787   $ 19,787  
Weighted-average remaining contractual term Outstanding, end of period (in years) 2 years 9 months 11 days   2 years 9 months 11 days  
Weighted-average remaining contractual term Exercisable, end of period (in years) 2 years 4 months 11 days   2 years 4 months 11 days  
Non-employee Director Stock Options [Member]
        
Employee activity - stock options [Abstract]        
Outstanding, end of period (in shares) 26,250   26,250  
Exercisable, end of period (in dollars per share) $ 23   $ 23  
Weighted-average remaining contractual term Outstanding, end of period (in years)     1 year 6 months  
Non-employee Director Activity - Options [Abstract]        
Terms of options granted to non-employee directors (in years)     10 years