If only the salt and the hash were stolen as is being stated, and you used secure (read, non-dictionary-word-derived strings) you're probably okay even if you r

If only the salt and the hash were stolen as is being stated, and you used secure (read, non-dictionary-word-derived strings) you're probably okay even if you reused passwords. But you shouldn't be reusing passwords anyway, of course, so go change them regardless.