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, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Y
Mar. 31, 2011
Share Based Compensation (Textual) [Abstract]    
Share- based compensation expense $ 3.5 $ 3.7
Unrecognized compensation cost related to nonvested $ 8.0  
Unrecognized compensation cost weighted average 0.6