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, 2013
Dec. 31, 2012
Dec. 31, 2011
Non-Vested Shares [Line Items]      
Share-based compensation $ 6,178 $ 6,050 $ 5,971
Employee Non-vested Shares [Member]
      
Non-Vested Shares [Line Items]      
Non-vested share vesting period 3 years    
Weighted average grant date fair value of non-vested shares at beginning of year $ 33 $ 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  
Weighted Average Grant Date Fair Value $ 37 $ 37 $ 29
Grant date fair value of shares that vested during the year 2,503 1,249  
Outstanding at beginning of year (shares) 168 108  
Granted (shares) 98 103 108
Vested (shares) (68) (36)  
Outstanding at end of year (shares) 186 168 108
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    
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
Nonemployee Director Nonvested Shares Granted Member
      
Non-Vested Shares [Line Items]      
Non-vested share vesting period 1 year    
Weighted average grant date fair value of non-vested shares at beginning of year $ 32 $ 33 $ 29
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 32 $ 32 $ 29
Weighted Average Grant Date Fair Value $ 38 $ 32 $ 33
Grant date fair value of shares that vested during the year 762 752 615
Outstanding at beginning of year (shares) 20 24 19
Granted (shares) 15 20 24
Vested (shares) (20) (24) (19)
Outstanding at end of year (shares) 15 20 24
Share-based compensation 589 687 707
Tax benefit related to share-based compensation expense 225 264 274
Unrecognized compensation cost 194    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period, Total Fair Value $ 560 $ 640 $ 776