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, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 1,677 $ 1,536 $ 3,329 $ 3,094
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) 190   186  
Stock Issued During Period, Shares, Restricted Stock Award, Gross 0   97  
Shares Vested in Period (1)   (94)  
Shares Forfeited in Period 0   0  
Outstanding and non-vested, end of period (in shares) 189   189  
Outstanding and non-vested, weighted-average grant date fair value, beginning of period $ 40   $ 35  
Grants in Period, Weighted Average Grant Date Fair Value $ 0   $ 42  
Vested in Period, Weighed-average grant date fair value $ 43   $ 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 7,559   7,559  
Share-based compensation expense 895 765 1,820 1,508
Tax benefit related to share-based expense 341 292 693 576
Unrecognized share-based compensation, net of estimated forfeitures $ 6,087 $ 5,338 $ 6,087 $ 5,338