date:Feb 08, 2014
ed costs as a percent of sales were the main driver of the increase. Acquisition-related costs of $17.8 million negatively impacted SDA by 50 basis points as a percent of sales during 2013. During 2012, acquisition-related costs of $9.6 million negatively impacted SDA by 30 basis points as a percent of sales.
Depreciation and amortization expenses for the year remained relatively stable as a percent of sales compared to last year. Net interest expense increased in 2013 compared to 2012 primaril