Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plan (Details)

v2.4.0.6
Employee Benefit Plan (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Employee Benefit Plan [Abstract]      
Percentage of matching contribution of each participants 100.00% 100.00% 100.00%
Maximum contribution percentage of participating employees 5.00% 5.00% 5.00%
Company's contribution to the 401K plan $ 1.8 $ 1.4 $ 1.5