Detwiler, 29, was released by the Rangers on Wednesday. He began the season as a starter and was 0-5 with a 6.95 ERA through seven outings. Texas then moved him to the bullpen, where he compiled a 7.71 ERA with 14 hits, five walks and six strikeouts over 9 1/3 innings.
He spent the previous six years with the Nationals, bouncing between the rotation and the bullpen en route to a 3.83 ERA. During that time he pitched 64 2/3 innings against the Braves, with a 3.06 ERA.