.55 per share . at year-end 2018 , 10.7 million shares remained available for repurchase under board approved authorizations , and on february 15 , 2019 , our board of directors further increased our common stock repurchase authorization by 25 million shares . for additional information , see 201cfourth quarter 2018 issuer purchases of equity securities 201d in part ii , item 5 . dividends . our board of directors declared the following quarterly cash dividends in 2018 : ( 1 ) $ 0