Sure, thanks, Jim. So, keep in mind, as we said, we maintain productivity during the quarter. In fact, in a couple of lines of business we actually improved productivity. So, we measure units per hour, as an example in our front loader or commercial line of business. We've flexed our costs almost exactly against the change in revenues. We've parked hundreds of trucks, as a result of the volume loss. We've unfortunately had to send people home, as a result of that, but our team has been very efficient and very real time in adjusting to those changes. So, in the past, we've actually done a good job, I think, over the last year as the volume is decreased, flexing the commercial or the roll-off side of business, and that's continued. Now we're seeing the lag effect in our commercial line of business. We've flexed that as well and up until now, we've told you that we've had a difficult time changing our cost structure in the disposal line of business, because there is so much fixed cost, but we've seen enough volume dropped in the landfills in the post collection side, that we've actually been able to make some changes there as well. So again, we measure productivity against the tons we take in on an hourly basis, and accordingly, we adjust the number of pieces of equipment we run at the landfill. We reduce personnel staffing levels. We've actually gone to the next level of adjusting hours of operation, where we're opening the gate later, we're closing the gate earlier. In some markets, we are actually closing our landfills on Saturday. So, we have three or four landfills in the marketplace, Detroit would be an example, where we're actually only going to remain one landfill open on the weekend. So again, we're flexing those costs down, as the volume changes, and frankly, as the volume comes back, some of those changes maybe permanent. Those hours of operation changes may become permanent. So, we've become pretty good cost managers process, and if volume comes back, we think we'll get the benefit of that as well as obviously the benefit of the volume coming back at that higher prices, because we've been able to maintain the prices. So again, we've parked hundred of trucks. We've made the staffing level adjustments. Our field is reacted very well to this and again, it shows up the margin. So, we are very proud of productivity volumes.