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, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 1,676 $ 1,525 $ 5,005 $ 4,619
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) 189   186  
Stock Issued During Period, Shares, Restricted Stock Award, Gross 2   99  
Shares Vested in Period 0   (94)  
Shares Forfeited in Period 0   0  
Outstanding and non-vested, end of period (in shares) 191   191  
Outstanding and non-vested, weighted-average grant date fair value, beginning of period $ 40   $ 35  
Grants in Period, Weighted Average Grant Date Fair Value $ 47   $ 43  
Vested in Period, Weighed-average grant date fair value $ 0   $ 43  
Forfeited in period (in dollars per share) $ 0   $ 0  
Outstanding and non-vested, weighted-average grant date fair value, end of period $ 40   $ 40  
Outstanding and non-vested, aggregate grant date fair value 7,606   7,606  
Share-based compensation expense 906 781 2,726 2,289
Tax benefit related to share-based expense 345 297 1,039 872
Unrecognized share-based compensation, net of estimated forfeitures $ 5,241 $ 4,508 $ 5,241 $ 4,508