Among the earnings stories late Monday, May 4, from AP Financial News: COLUMBUS, Ohio (AP) ¿ Chesapeake Energy on Monday posted a nearly $6 billion loss for the first quarter as tumbling natural gas prices forced one of the nation's largest gas producers to write down the value of its gas and oil properties. LOUISVILLE, Ky. (AP) ¿ Restaurant chain Texas Roadhouse Inc. said Monday its first-quarter profit rose 11 percent due primarily to sales at new restaurants. NEW YORK (AP) ¿ Chinese online game company Changyou.com Ltd., which went public last month, said Monday its first-quarter profit more than doubled as people continued to embrace its games as a form of low-cost entertainment. PORTLAND, Ore. (AP) ¿ Portland General Electric Co., Oregon's largest utility, on Monday said its first-quarter profit rose 11 percent on higher prices, partially offset by lower sales volumes and higher costs. EAST AURORA, N.Y. (AP) ¿ Astronics Corp., which makes lighting and electronics systems for the aerospace industry, said Monday its first-quarter profit tumbled 47 percent because of cost-cutting measures prompted by weaker demand.