That's one that I looked at maybe 6 months ago and ended up passing on. I'm thinking of having another look, but if I remember correctly, they had wonderful ROIC and a very interesting asset-light business model, but at the time I didn't understand very well why their FCF/share was declining and debt going up (maybe it's just cyclical as this blog post says, but I don't understand the industry dynamics well enough to be sure).
Definitely an interesting business, though.