Combine water, molasses, butter, sugars, and salt in large pan; heat until butter is melted. Remove from heat. Stir in rye flour, then yeast. Add as much white flour as possible. Knead on floured surface until satiny. Cover; let rise until doubled. Punch down and let rise again. Shape into 3 loaves and put in greased pans. Cover and let rise. Bake at 350 degrees for 50 minutes.