Employee Benefit Plan

12 Months Ended

Dec. 31, 2012

Employee Benefit Plan [Abstract]

Employee Benefit Plan

(14) Employee Benefit Plan

We maintain defined contribution retirement plans (a 401(k) profit sharing plan for the U.S. employees and Registered Retirement Saving Plan (RRSP) for the Canadian employees), covering employees who meet the minimum service requirements and have elected to participate.  We made matching contributions (under the 401(k) profit sharing plan for the U.S. employees and Deferred Profit Sharing Plan (DPSP) for the Canadian employees) equal to a maximum of 3.0% in 2012, 2011 and 2010.  Our matching contributions totaled $1,225, $1,905, and $993, in 2012, 2011, and 2010, respectively.