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Defined Contribution Plan
12 Months Ended
Dec. 31, 2011
Defined Contribution Plan [Abstract]  
Defined Contribution Plan
Defined Contribution Plan

We sponsor a defined contribution 401(k) plan, which allows our U.S.-based employees to voluntarily contribute pre-tax dollars up to a maximum amount allowable by the U.S. Internal Revenue Service. In 2011, we made matching contributions to our 401(k) plan in the United States in an amount equal to 75 cents for every dollar of an employee's contribution, up to a maximum of 7% of the employee's compensation in the pay period. In 2010, we made matching contributions to our 401(k) plan in the United States in an amount equal to 50 cents for every dollar of an employee's contribution, up to a maximum of 7% of the employee's compensation in the pay period. In 2009, we suspended matching contributions to our 401(k) program in the United States.

The following table summarizes our matching contributions:

($000)
 
2011

 
2010

 
2009

401(k) matching contributions
 
$
5,601

 
$
3,321

 
$