Quarterly report pursuant to Section 13 or 15(d)

Share-Based Payments - Non-employee Director Non-vested Shares (Details)

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Share-Based Payments - Non-employee Director 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]        
Non-Employee Director Shares, Vesting Period (in years)     1 year  
Share-based compensation expense $ 1,677 $ 1,536 $ 3,329 $ 3,094
Nonemployee Director Nonvested Shares Granted Member
        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding and non-vested, beginning of period (in shares) 15   15  
Grants in Period 14   14  
Shares Vested in Period (15)   (15)  
Outstanding and non-vested, end of period (in shares) 14   14  
Outstanding and non-vested, weighted-average grant date fair value, beginning of period $ 38   $ 38  
Grants in Period, Weighted Average Grant Date Fair Value $ 43   $ 43  
Vested in Period, Weighed-average grant date fair value $ 38   $ 38  
Outstanding and non-vested, weighted-average grant date fair value, end of period $ 43   $ 43  
Outstanding and non-vested, aggregate grant date fair value 602   602  
Share-based compensation expense 144 151 281 308
Tax benefit related to share-based expense 55 58 107 118
Unrecognized share-based compensation, net of estimated forfeitures $ 515 $ 476 $ 515 $ 476