Quarterly report pursuant to Section 13 or 15(d)

Share-Based Payments - Employee Activity Non-vested Shares (Details)

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Share-Based Payments - Employee Activity 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]        
Share-based compensation expense $ 1,517 $ 1,512 $ 3,123 $ 2,955
Employee Non-vested Shares [Member]
        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grants, vesting period (in years)     3  
Outstanding and non-vested, beginning of period (in shares) 175   108  
Stock Issued During Period, Shares, Restricted Stock Award, Gross 0   103  
Shares Vested in Period 0   (36)  
Shares Forfeited in Period (1)   (1)  
Outstanding and non-vested, end of period (in shares) 174   174  
Outstanding and non-vested, weighted-average grant date fair value, beginning of period $ 33   $ 29  
Grants in Period, Weighted Average Grant Date Fair Value $ 0   $ 37  
Vested in Period, Weighed-average grant date fair value $ 0   $ 29  
Forfeited in Period, Weighted Average Grant Date Fair Value $ 37   $ 37  
Outstanding and non-vested, weighted-average grant date fair value, end of period $ 33   $ 33  
Outstanding and non-vested, aggregate grant date fair value 5,780   5,780  
Share-based compensation expense 552 252 997 388
Tax benefit related to share-based expense 212 100 384 154
Unrecognized share-based compensation, net of estimated forfeitures $ 4,735 $ 2,601 $ 4,735 $ 2,601