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 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 1,428 $ 1,502 $ 4,550 $ 4,457
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) 174   108  
Stock Issued During Period, Shares, Restricted Stock Award, Gross 0   103  
Shares Vested in Period 0   (36)  
Shares Forfeited in Period (6)   (7)  
Outstanding and non-vested, end of period (in shares) 168   168  
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 $ 33   $ 33  
Outstanding and non-vested, weighted-average grant date fair value, end of period $ 33   $ 33  
Outstanding and non-vested, aggregate grant date fair value 5,579   5,579  
Share-based compensation expense 506 253 1,502 641
Tax benefit related to share-based expense 196 100 581 252
Unrecognized share-based compensation, net of estimated forfeitures $ 4,035 $ 2,348 $ 4,035 $ 2,348