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
Mar. 31, 2013
Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Non-Employee Director Shares, Vesting Period (in years) 1  
Share-based compensation expense $ 1,557 $ 1,606
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) 20  
Grants in Period 0  
Shares Vested in Period 0  
Outstanding and non-vested, end of period (in shares) 20  
Outstanding and non-vested, weighted-average grant date fair value, beginning of period $ 32  
Grants in Period, Weighted Average Grant Date Fair Value $ 0  
Vested in Period, Weighed-average grant date fair value $ 0  
Outstanding and non-vested, weighted-average grant date fair value, end of period $ 32  
Outstanding and non-vested, aggregate grant date fair value 640  
Share-based compensation expense 157 192
Tax benefit related to share-based expense 60 75
Unrecognized share-based compensation, net of estimated forfeitures $ 67 $ 78