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 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 1,428 $ 1,502 $ 4,550 $ 4,457
Employee Stock Option [Member]
        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 575 959 1,994 3,023
Tax benefit related to share-based expense 167 252 546 803
Unrecognized share-based compensation, net of estimated forfeitures 2,052 3,769 2,052 3,769
Employee activity - stock options [Abstract]        
Stock option grants expire (in years)     7  
Grants, vesting period (in years)     3  
Expected dividend yield (in hundredths)     0.90% 1.00%
Expected stock price volatility     46.60% 44.90%
Weighted Average Risk Free Interest Rate     0.80% 2.40%
Expected life of options (in years)     4.2 4.6
Weighted-average fair value of options (dollars per share)     $ 13 $ 11
Outstanding, beginning of period (in shares) 3,138,000   3,363,000  
Granted (in shares) 0   93,000  
Exercised (in shares) (252,000)   (570,000)  
Forfeited (in shares) (11,000)   (11,000)  
Outstanding, end of period (in shares) 2,875,000   2,875,000  
Exercisable, end of period (in shares) 2,487,000   2,487,000  
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) $ 28   $ 27  
Forfeited in period (in dollars per share) $ 29   $ 29  
Outstanding, end of period (in dollars per share) $ 26   $ 26  
Exercisable, end of period (in dollars per share) $ 26   $ 26  
Aggregate Intrinsic Value Outstanding, end of period 20,497   20,497  
Aggregate Intrinsic Value Exercisable, end of period $ 17,994   $ 17,994  
Weighted-average remaining contractual term Outstanding, end of period (in years) 2.8   2.8  
Weighted-average remaining contractual term Exercisable, end of period (in years) 2.4   2.4  
Non-employee Director Stock Options [Member]
        
Employee activity - stock options [Abstract]        
Outstanding, end of period (in shares) 29,375   29,375  
Exercisable, end of period (in dollars per share) $ 23   $ 23  
Weighted-average remaining contractual term Outstanding, end of period (in years) 2.2   2.2  
Non-employee Director Activity - Options [Abstract]        
Terms of options granted to non-employee directors (in years) 10   10