Annual report pursuant to Section 13 and 15(d)

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

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Shareholders' Equity, Stock Options and Net Income per Share - Employee Activity 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
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based awards, vesting period 3 years    
Share-based compensation $ 6,050 $ 5,971 $ 6,284
Employee Non-vested Shares [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding at beginning of year (shares) 108    
Granted (shares) 103 108  
Vested (shares) (36)    
Forfeited (shares) (7)    
Outstanding at end of year (shares) 168 108  
Weighted average grant date fair value of non-vested shares at beginning of year $ 29    
Weighted Average Grant Date Fair Value $ 37 $ 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    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period, Weighted Average Grant Date Fair Value $ 33    
Weighted average grant date fair value non-vested shares at end of year $ 33 $ 29  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period, Total Fair Value 5,579 3,076  
Grant date fair value of shares that vested during the year 1,249    
Share-based compensation 2,039 895  
Tax benefit related to share-based compensation expense 785 347  
Unrecognized compensation cost $ 3,722