A different kind of writing

Usually, when I'm writing, I have as little idea of the ending as the reader. That's why the last page or two usually take longer than the rest of the story put together. This time something different is going on. I actually know I want to end a story, or not exactly, but I've already had the little epiphany at the end that will hold the piece together. Now, I'm trying not to rush to the ending. I'm trying to make sure that enough detail exists that it will really be a story before I get to the end.