Sure. So I think in terms of thinking through how 2013 will unfold, I think it's important to just take a look at how 2012 unfolded, which if you recall, the first couple of quarters, they came in a bit ahead of our expectations, largely as a result of us pulling back a bit on sales and marketing. As we were turning around Brand Expedia, we were a little bit more cautious. That creates some pretty hard comps for us as we go into 2013. The other factor that you mentioned was the addition of VIA Travel, and VIA Travel closed at the beginning of Q2. Q2, in terms of revenue growth, is about 200 bps; Q3, 300 bps; Q4, 400 bps. So you saw this sort of acceleration assistance, if you will, by VIA, which will get sort of one quarter in, in Q1 but then it will dissipate. And then I think the last big factor for 2012 was the fact that you saw Brand Expedia really turn around. And it started to accelerate through 2012. And that will create harder comps for us as we move through 2013. So if you roll that forward then to Q1, what you might expect to see is -- and really rolling through 2013, is increasingly hard comps rolling through the year on revenue and increasingly, call it easier comps on expenses, which results in a bit of a back end weighted plan, and that's certainly what we are -- what we're expecting. I would add though, that the one thing that you saw in 2012, which I would just caution you all about, that you may expect to see in 2013, is that the shape of 2012 did change as we moved through the year. And that's because we have really shortened the cycle times around how quickly we make capital allocation and planning decisions and how quickly we're able to execute things. This has been enabled [ph] by new business processes and really, a large part by the technology platforms that we've got in place now that allow us to iterate, test and learn much more quickly. So as we move through 2012, we were able to, as we saw strong performance on the top line, take that money, reinvest it in things. As we did to VIA Travel acquisition, we're able to make incremental decisions around technology integration and we're going to continue to do that in 2013. So the guidance we're giving you today is really a reasonable view based on what we can see right now but we will be making decisions through the year and we'll update you as we do so on the quarterly calls.