|                                        | Balance at   |       | Charged to Costs |       |                              |   |       | Write-offs Net |       | Balance at End |
|---------------------------------------------|--------------|--------------------------------|------------------|--------------------------------|-----------------------------------|--------|--------------------------------|----------------|--------------------------------|----------------|
|                                        | Beginning of |                           | and              |                           |                              |   |                           | of             |                           | of             |
|                                        | Year         |                           | Expenses         |                           | Other                             |   | Recoveries                     |           | Year                           |
| Allowance for Doubtful Accounts             |         |                           |             |                           |                              |   |                           |           |                           |           |   |   |   |   |   |   |   |   |
|     2010                |   $     | 1,355                          |        |                           |        $ | 80     |            |           | $                              | 2              |   | $ | (737 | ) |   | $ | 700 |   |
|     2009                | $            | 3,716                          |             |                           | $                                 | 1,312  |                           |           | $                              | 2              |   | $ | (3,675 | ) |   | $ | 1,355 |   |
|     2008                | $            | 3,687                          |             |                           | $                                 | 823    |                           |           | $                              | 5              |   | $ | (799 | ) |   | $ | 3,716 |   |
| Valuation Allowance for Deferred Tax Assets |         |                           |             |                           |                              |   |                           |           |                           |           |   |   |   |   |   |   |   |   |
|     2010                | $            | 323,803                        |             |                           | $                                 | (3,305 | )                              |           | $                              | —        |   | $ | — |   |   | $ | 320,498 |   |
|     2009                | $            | 311,014                        |             |                           | $                                 | 12,789 |                           |           | $                              | —        |   | $ | — |   |   | $ | 323,803 |   |
|     2008                | $            | 303,570                        |             |                           | $                                 | 444    |                           |           | $                              | —        |   | $ | — |   |   | $ | 311,014 |   |

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