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, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation $ 6,178 $ 6,050 $ 5,971
Employee Non-vested Shares [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding at beginning of year (shares) 168 108  
Granted (shares) 98 103 108
Vested (shares) (68) (36)  
Forfeited (shares) (12) (7)  
Outstanding at end of year (shares) 186 168 108
Weighted average grant date fair value of non-vested shares at beginning of year $ 33 $ 29  
Weighted Average Grant Date Fair Value $ 37 $ 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 $ 37 $ 29  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period, Weighted Average Grant Date Fair Value $ 36 $ 33  
Weighted average grant date fair value non-vested shares at end of year $ 35 $ 33 $ 29
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period, Total Fair Value 6,588 5,579 3,076
Grant date fair value of shares that vested during the year 2,503 1,249  
Share-based awards, vesting period 3 years    
Share-based compensation 3,058 2,039 895
Tax benefit related to share-based compensation expense 1,165 785 347
Unrecognized compensation cost $ 3,856