Annual report pursuant to Section 13 and 15(d)

Share Based Compensation (Details Textual)

v2.4.0.6
Share Based Compensation (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Y
Dec. 31, 2010
Dec. 31, 2009
Share Based Compensation (Textuals) [Abstract]      
Total fair value of awards vested $ 11.2 $ 3.0 $ 1.8
Share Based Compensation (Additional Textuals) [Abstract]      
Typical vesting rate for options granted Over three years    
Cash received for exercises of stock options 0.5 0.2  
Tax benefit realized from stock option exercises 0.1 0.1  
Exercise of stock option (124,000)   0
Award vested as of grant date 1.00%    
Granted, weighted average grant date fair value per share $ 6.24 $ 6.15 $ 3.68
Total unrecognized compensation cost related to nonvested awards $ 28.2    
Weighted-average expense recognition period 1.9    
Common stock authorized for issuance 37,800,000    
Common stock outstanding 34,800,000    
Common stock available for future grants 3,000,000    
After May 2004 [Member]
     
Share Based Compensation (Textuals) [Abstract]      
Options granted, term P7Y    
Prior to May 2004 [Member]
     
Share Based Compensation (Textuals) [Abstract]      
Options granted, term P10Y    
Restricted stock awards [Member]
     
Share Based Compensation (Additional Textuals) [Abstract]      
Granted, weighted average grant date fair value per share $ 0