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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
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 $ 1,525 $ 1,428 $ 4,619 $ 4,550
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   20  
Grants in Period 0   15  
Shares Vested in Period 0   (20)  
Outstanding and non-vested, end of period (in shares) 15   15  
Outstanding and non-vested, weighted-average grant date fair value, beginning of period $ 38   $ 32  
Grants in Period, Weighted Average Grant Date Fair Value $ 0   $ 38  
Vested in Period, Weighed-average grant date fair value $ 0   $ 32  
Outstanding and non-vested, weighted-average grant date fair value, end of period $ 38   $ 38  
Outstanding and non-vested, aggregate grant date fair value 560   560  
Share-based compensation expense 141 161 448 526
Tax benefit related to share-based expense 54 62 171 204
Unrecognized share-based compensation, net of estimated forfeitures $ 335 $ 385 $ 335 $ 385