Quarterly report pursuant to Section 13 or 15(d)

Share-Based Payments - Non-employee Director Non-vested Shares (Details)

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Share-Based Payments - Non-employee Director Non-vested Shares (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Non-Employee Director Shares, Vesting Period (in years)     1  
Share-based compensation expense $ 1,517 $ 1,512 $ 3,123 $ 2,955
Nonemployee Director Nonvested Shares Granted Member
        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding and non-vested, beginning of period (in shares) 22   24  
Grants in Period 20   20  
Shares Vested in Period (22)   (24)  
Outstanding and non-vested, end of period (in shares) 20   20  
Outstanding and non-vested, weighted-average grant date fair value, beginning of period $ 33   $ 33  
Grants in Period, Weighted Average Grant Date Fair Value $ 32   $ 32  
Vested in Period, Weighed-average grant date fair value $ 33   $ 33  
Outstanding and non-vested, weighted-average grant date fair value, end of period $ 32   $ 32  
Outstanding and non-vested, aggregate grant date fair value 640   640  
Share-based compensation expense 173 180 365 318
Tax benefit related to share-based expense 67 72 141 126
Unrecognized share-based compensation, net of estimated forfeitures $ 546 $ 660 $ 546 $ 660