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, 2012
Dec. 31, 2011
Dec. 31, 2010
Share Based Compensation (Textuals) [Abstract]      
Total fair value of awards vested $ 9.1 $ 11.2 $ 3.0
Share Based Compensation (Additional Textuals) [Abstract]      
Typical vesting rate for options granted 3 years    
Cash received for exercises of stock options 2.3 0.5 0.2
Tax benefit realized from stock option exercises 0.3 0.1 0.1
Exercise of stock option 520,000   0
Award vested as of grant date 100.00%    
Granted, weighted average grant date fair value per share $ 6.69 $ 6.24 $ 6.15
Total unrecognized compensation cost related to nonvested awards $ 32.8    
Weighted-average expense recognition period 2 years    
Common stock available for future grants 39,400,000    
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