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 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]        
Non-Employee Director Shares, Vesting Period (in years)     1 year  
Share-based compensation expense $ 1,676 $ 1,525 $ 5,005 $ 4,619
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) 14   15  
Grants in Period 0   14  
Shares Vested in Period 0   (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 $ 43   $ 38  
Grants in Period, Weighted Average Grant Date Fair Value $ 0   $ 43  
Vested in Period, Weighed-average grant date fair value $ 0   $ 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 152 141 433 448
Tax benefit related to share-based expense 58 54 165 171
Unrecognized share-based compensation, net of estimated forfeitures $ 363 $ 335 $ 363 $ 335