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|                                                          |   |                         |    |   |   |   |    |   |   |   |    |   |   |   |    |
|---------------------------------------------------------------|--------|------------------------------|---------|--------|--------|--------|---------|--------|--------|--------|---------|--------|--------|--------|---------|
|                                                          |   |                         |    |   |   |   |    |   |   |   |    |   |   |   |    |
|                                                          |   | Year      Ended December 31, |    |
|                                                          |   | 2003                         |    |   | 2004   |   |    | 2005   |   |   | 2006    |   |   | 2007   |    |
|                                                          |   |                         |    |   |   |   |    |   |   |   |    |   |   |   |    |
| Earnings:                                                     |   |                         |    |   |   |   |    |   |   |   |    |   |   |   |    |
| Income      before income taxes                               |   | $                            | 103,340 |   |   | $      | 115,609 |   |   |   | 132,588 |   |   |   | 125,752 |   |   |   | 158,998 |   |
| Plus:  fixed      charges per below                 |   |                         | 33,513  |   |   |   | 23,999  |   |   |   | 26,547  |   |   |   | 32,399  |   |   |   | 36,657 |   |
| Less:      capitalized interest per below                     |   |                         | 29      |   |   |   | 167     |   |   |   | 432     |   |   |   | 654     |   |   |   | 206 |   |
| Plus:  current      period amortization of interest |   |                         |    |   |   |   |    |   |   |   |    |   |   |   |    |   |   |   |   |   |
| capitalized      in prior periods                             |   |                         | 9       |   |   |   | 13      |   |   |   | 21      |   |   |   | 30      |   |   |   | 39 |   |
|                                                          |   |                         |    |   |   |   |    |   |   |   |    |   |   |   |    |   |   |   |   |   |
| Total      earnings                                           |   | $                            | 136,833 |   |   | $      | 139,454 |   |   | $      | 158,724 |   |   | $      | 157,527 |   |   | $ | 195,488 |   |
|                                                          |   |                         |    |   |   |   |    |   |   |   |    |   |   |   |    |   |   |   |   |   |
| Fixed      charges                                            |   |                         |    |   |   |   |    |   |   |   |    |   |   |   |    |   |   |   |   |   |
| Interest      expense                                         |   | $                            | 31,666  |   |   | $      | 21,724  |   |   | $      | 23,489  |   |   | $      | 28,970  |   |   | $ | 33,430 |   |
| Capitalized      interest                                     |   |                         | 29      |   |   |   | 167     |   |   |   | 432     |   |   |   | 654     |   |   |   | 206 |   |
| Interest      portion of rent expense                         |   |                         | 1,818   |   |   |   | 2,108   |   |   |   | 2,626   |   |   |   | 2,775   |   |   |   | 3,021 |   |
|                                                          |   |                         |    |   |   |   |    |   |   |   |    |   |   |   |    |   |   |   |   |   |
| Total      fixed charges                                      |   | $                            | 33,513  |   |   | $      | 23,999  |   |   | $      | 26,547  |   |   | $      | 32,399  |   |   | $ | 36,657 |   |
|                                                          |   |                         |    |   |   |   |    |   |   |   |    |   |   |   |    |   |   |   |   |   |
| Ratio      of earnings to fixed charges                       |   |                         | 4.1     |   |   |   | 5.8     |   |   |   | 6.0     |   |   |   | 4.9     |   |   |   | 5.3 |   |