Net sales for the International segment of $729.3 million increased $13.6 million, or 1.9 percent, from the fourth quarter of 2011, inclusive of a 150 basis point favorable impact from increased pass-through paper sales and changes in foreign exchange rates. The balance of the change in net sales was driven by volume increases in Asia and Latin America. The segment's operating loss of $21.0 million in the fourth quarter of 2012, which was impacted by charges for impairment and restructuring of $75.9 million as well as a $3.7 million gain on pension curtailment, compared to an operating loss of $89.0 million in the fourth quarter of 2011, which included charges for impairment and restructuring of $133.4 million. The segment's non-GAAP operating margin improved to 7.0 percent in the fourth quarter of 2012 from 6.2 percent in the fourth quarter of 2011 as higher volume and a favorable product mix were partially offset by pricing pressure and wage and other inflationary increases in certain countries.