Quarterly report pursuant to Section 13 or 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
3 Months Ended
Mar. 31, 2012
Y
Mar. 31, 2011
Share Based Compensation (Additional Textuals) [Abstract]    
Typical vesting rate for options granted Over three years  
Cash received for exercises of stock options $ 0.4 $ 0.1
Tax benefit realized from stock option exercises 0.1 0.1
Exercise of stock option 106,000  
Award vested as of grant date 1.00%  
Granted, weighted average grant date fair value per share $ 5.88  
Total unrecognized compensation cost related to nonvested awards 25.4  
Weighted-average expense recognition period 1.7  
Common stock authorized for issuance 36,900,000  
Common stock outstanding 34,000,000  
Common stock available for future grants 2,900,000  
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 (Textuals) [Abstract]    
Total fair value of awards vested $ 1.1 $ 0.2
Share Based Compensation (Additional Textuals) [Abstract]    
Granted, weighted average grant date fair value per share   $ 7.50