Quarterly report pursuant to Section 13 or 15(d)

Share-Based Payments - Stock Option Activity (Details)

v2.4.0.8
Share-Based Payments - Stock Option Activity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 1,525 $ 1,428 $ 4,619 $ 4,550
Employee Stock Option [Member]
        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 329 575 1,076 1,994
Tax benefit related to share-based expense 124 167 381 546
Unrecognized share-based compensation, net of estimated forfeitures 1,899 2,052 1,899 2,052
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%   1.20% 0.90%
Expected stock price volatility 43.40%   43.70% 46.60%
Weighted Average Risk Free Interest Rate 1.50%   0.90% 0.80%
Expected life of options (in years) 4 years 6 months 11 days   5 years 3 months 11 days 4 years 2 months 11 days
Weighted-average fair value of options (dollars per share) $ 13   $ 13 $ 13
Outstanding, beginning of period (in shares) 1,902,000   2,874,000  
Granted (in shares) 5,000   114,000  
Exercised (in shares) (69,000)   (1,150,000)  
Forfeited (in shares) 0   0  
Outstanding, end of period (in shares) 1,838,000   1,838,000  
Exercisable, end of period (in shares) 1,622,000   1,622,000  
Outstanding, beginning of period (in dollars per share) $ 27   $ 26  
Grants in Period (in dollars per share) $ 37   $ 37  
Exercises in Period (in dollars per share) $ 24   $ 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 19,715   19,715  
Aggregate Intrinsic Value Exercisable, end of period $ 19,159   $ 19,159  
Weighted-average remaining contractual term Outstanding, end of period (in years) 2 years 7 months 11 days   2 years 7 months 11 days  
Weighted-average remaining contractual term Exercisable, end of period (in years) 2 years 2 months 11 days   2 years 2 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 2 months 11 days  
Non-employee Director Activity - Options [Abstract]        
Terms of options granted to non-employee directors (in years)     10 years