Quarterly report pursuant to Section 13 or 15(d)

Share Based Compensation (Details Textual)

v2.4.0.6
Share Based Compensation (Details Textual) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Y
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Share Based Compensation (Textuals) [Abstract]        
Total fair value of awards vested $ 1,700,000 $ 2,700,000    
Share Based Compensation (Additional Textuals) [Abstract]        
Typical vesting rate for options granted Over three years      
Cash received for exercises of stock options     800,000 200,000
Tax benefit realized from stock option exercises     0.1 0.0
Exercise of stock option     190,000  
Award vested as of grant date 1.00%      
Granted, weighted average grant date fair value per share $ 6.71 $ 7.45    
Total unrecognized compensation cost related to nonvested awards $ 41,600,000   $ 41,600,000  
Weighted-average expense recognition period 1.8      
Common stock authorized for issuance 84,000,000   84,000,000  
Common stock outstanding 42,000,000      
Common stock available for future grants 42,000,000   42,000,000  
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