Annual report pursuant to Section 13 and 15(d)

Shareholders' Equity, Stock Options and Net Income per Share - Non-employee Director Non-vested Shares (Details)

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Shareholders' Equity, Stock Options and Net Income per Share - Non-employee Director Non-vested Shares (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Non-Vested Shares [Line Items]      
Non-employee director, non-vested share vesting period 3 years    
Share-based compensation $ 6,050 $ 5,971 $ 6,284
Employee Non-vested Shares [Member]
     
Non-Vested Shares [Line Items]      
Weighted average grant date fair value of non-vested shares at beginning of year $ 29    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 29    
Weighted Average Grant Date Fair Value $ 37 $ 29  
Grant date fair value of shares that vested during the year 1,249    
Outstanding at beginning of year (shares) 108    
Granted (shares) 103 108  
Vested (shares) (36)    
Outstanding at end of year (shares) 168 108  
Share-based compensation 2,039 895  
Tax benefit related to share-based compensation expense 785 347  
Unrecognized compensation cost 3,722    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period, Total Fair Value 5,579 3,076  
Nonemployee Director Nonvested Shares Granted Member
     
Non-Vested Shares [Line Items]      
Non-employee director, non-vested share vesting period   1  
Weighted average grant date fair value of non-vested shares at beginning of year $ 33 $ 29 $ 18
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 32 $ 29 $ 18
Weighted Average Grant Date Fair Value $ 32 $ 33 $ 29
Grant date fair value of shares that vested during the year 752 615 892
Outstanding at beginning of year (shares) 24 19 31
Granted (shares) 20 24 19
Vested (shares) (24) (19) (31)
Outstanding at end of year (shares) 20 24 19
Share-based compensation 687 707 563
Tax benefit related to share-based compensation expense 264 274 226
Unrecognized compensation cost 224    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period, Total Fair Value $ 640 $ 776 $ 560