Shares of Casey’s General Stores soared after the convenience store operator’s strong earnings report included a dividend raise and upbeat outlook. Late Monday, Casey’s said it earned $2.63 a share in the quarter ended April 30, easily ahead of the $1.95 consensus estimate. Inside same-store sales, which exclude gasoline sales, climbed 1.7% in the quarter, and the company raised its quarterly dividend by 14% to 57 cents a share.