ARLINGTON, Va.--(BUSINESS WIRE)--Graham Holdings Company (NYSE: GHC) today reported income from continuing operations attributable to common shares of $21.4 million ($3.62 per share) for the first quarter of 2015, compared to $130.4 million ($17.56 per share) for the first quarter of 2014. Net income attributable to common shares was $20.6 million ($3.48 per share) for the first quarter ended March 31, 2015, compared to $132.1 million ($17.79 per share) for the first quarter of last year. Net i