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Retirement Savings Plan	12 Months Ended
Retirement Savings Plan	Dec. 31, 2011
Retirement Savings Plan [Abstract]
Retirement Savings Plan	12. RETIREMENT SAVINGS PLAN Substantially all of our employees in the United States are eligible to participate in a qualified defined contribution 401(k) plan in which participants may elect to have a specified portion of their salary contributed to the plan and we may make discretionary contributions to the plan. Flow Traffic and CitySync are obligated to contribute to certain employee pension plans. We made contributions totaling $170,000, $131,000 and $98,000 to the plans for 2011, 2010 and 2009, respectively.

The entire disclosure for pension and other postretirement benefits.

+ References

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