Preheat oven to 350 degrees F (175 degrees C). In a medium bowl, stir together the flour, baking soda, and salt; set aside.
In a large bowl, cream together the margarine and 2 cups sugar until light and fluffy. Beat in the eggs one at a time, then the vanilla. Gradually stir in the dry ingredients until just blended. Roll the dough into walnut sized balls and roll the balls in remaining 1/4 cup of sugar. Place cookies 2 inches apart onto ungreased cookie sheets and flatten slightly.
Bake for 8 to 10 minutes in the preheated oven, until lightly browned at the edges. Allow cookies to cool on baking sheet for 5 minutes before removing to a wire rack to cool completely.
