In a small saucepan bring vinegar to boiling. Reduce heat; simmer, uncovered, 5 minutes or until reduced to 1/4 cup. Stir tomatoes into hot vinegar reduction.
Meanwhile, trim fat from steaks. Sprinkle with salt and pepper. In a large skillet heat oil over medium-high heat. Add steaks; reduce heat to medium. Cook to desired doneness, turning once. Allow 7 to 9 minutes for medium-rare (145°F) to medium (160°F).
To serve, spoon vinegar reduction over steaks. Sprinkle with thyme.