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, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 1,536 $ 1,517 $ 3,094 $ 3,123
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) 197   168  
Stock Issued During Period, Shares, Restricted Stock Award, Gross 1   98  
Shares Vested in Period 0   (68)  
Shares Forfeited in Period (9)   (9)  
Outstanding and non-vested, end of period (in shares) 189   189  
Outstanding and non-vested, weighted-average grant date fair value, beginning of period $ 35   $ 33  
Grants in Period, Weighted Average Grant Date Fair Value $ 37   $ 37  
Vested in Period, Weighed-average grant date fair value $ 0   $ 37  
Forfeited in period (in dollars per share) $ 36   $ 36  
Outstanding and non-vested, weighted-average grant date fair value, end of period $ 35   $ 35  
Outstanding and non-vested, aggregate grant date fair value 6,689   6,689  
Share-based compensation expense 765 552 1,508 997
Tax benefit related to share-based expense 292 212 576 384
Unrecognized share-based compensation, net of estimated forfeitures $ 5,338 $ 4,735 $ 5,338 $ 4,735