These are accounts receivable, and the amount is based on two things. It's a percentage of the amounts we think may be uncollectible based on assessments of accounts. It really comprises two things. One is the receivable balance itself. If you're taking 20%, for example, as being uncollectible, as the receivable balance itself grows, that 20% grows. Then there are variables in the rate itself that get changed each year based on an assessment of individual accounts.
This number does not mean these amounts are not collectible. This is based on an extrapolation by looking at a series of accounts and pooling those assessments over the population of the receivable balance itself.