Quarterly report pursuant to Section 13 or 15(d)

Share Based Compensation (Details Textual)

v2.4.0.8
Share Based Compensation (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Share Based Compensation (Textuals) [Abstract]    
Total fair value of awards vested $ 9.6 $ 2.1
Share Based Compensation (Additional Textuals) [Abstract]    
Cash received for exercises of stock options 6.7  
Tax benefit realized from stock option exercises 0.3 0.2
Exercise of stock option 1,138,000  
Award vested as of grant date 100.00%  
Granted, weighted average grant date fair value per share $ 9.13 $ 7.14
Total unrecognized compensation cost related to nonvested awards $ 55.6  
Weighted-average expense recognition period 2 years 4 months  
Common stock available for future grants 23,700,000  
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