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
Mar. 31, 2013
Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 1,557 $ 1,606
Employee Non-vested Shares [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants, vesting period (in years) 3 years  
Outstanding and non-vested, beginning of period (in shares) 168  
Stock Issued During Period, Shares, Restricted Stock Award, Gross 97  
Shares Vested in Period (68)  
Shares Forfeited in Period 0  
Outstanding and non-vested, end of period (in shares) 197  
Outstanding and non-vested, weighted-average grant date fair value, beginning of period $ 33  
Grants in Period, Weighted Average Grant Date Fair Value $ 37  
Vested in Period, Weighed-average grant date fair value $ 37  
Outstanding and non-vested, weighted-average grant date fair value, end of period $ 35  
Outstanding and non-vested, aggregate grant date fair value 6,991  
Share-based compensation expense 743 445
Tax benefit related to share-based expense 284 174
Unrecognized share-based compensation, net of estimated forfeitures $ 6,398 $ 5,319