. the company 2019s expenses for material defined contribution plans for the years ended december 31 , 2012 , 2011 and 2010 were $ 42 million , $ 48 million and $ 23 million , respectively . beginning january 1 , 2012 , the company may make an additional discretionary 401 ( k ) plan matching contribution to eligible employees . for the year ended december 31 , 2012 , the company made no discretionary matching contributions . 8