Quarterly report pursuant to Section 13 or 15(d)

Share-Based Payments - Employee Activity Performance Shares (Details)

v2.4.0.6
Share-Based Payments - Employee Activity Performance Shares (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 1,606 $ 1,443
Key Employee Performance Share Based Plan [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Period of Share Price Performance Comparison to Peer Group 3 years  
Minimum percentage of peer group by which Company share price must outperform before incremental performance shares are issued 30.00%  
Percentage of Peer Group By Which Company Share Price Must Outperform Before Maximum Incremental Shares Are Issued 90.00%  
Expected Stock Price Volatility Rate 40.80% 47.70%
Weighted Average Risk Free Interest Rate 0.40% 1.40%
Outstanding and non-vested, beginning of period (in shares) 38  
Grants in Period 24  
Outstanding and non-vested, end of period (in shares) 62  
Outstanding and non-vested, weighted-average grant date fair value, beginning of period $ 30  
Grants in Period, Weighted Average Grant Date Fair Value $ 45  
Outstanding and non-vested, weighted-average grant date fair value, end of period $ 36  
Outstanding and non-vested, aggregate grant date fair value 2,205  
Share-based compensation expense 147 53
Tax benefit related to share-based expense 57 21
Unrecognized share-based compensation, net of estimated forfeitures $ 1,724 $ 1,164