|                                                                                   |                                                               |                                         |                            |      |                                                        |                                   | **Exhibit 12** |
|----------------------------------------------------------------------------------------|--------------------------------------------------------------------|----------------------------------------------|---------------------------------|-----------|-------------------------------------------------------------|----------------------------------------|----------------|
| **Computation of Ratio of Earnings to Fixed                        Charges**           |                                                               |                                         |                            |      |                                                        |
| (Dollars in thousands)                                                                 |                                                               |                                         |                            |      |                                                        |                                   |
|                                                                                   |                                                               |                                         |                            |      |                                                        |                                   |           |
|                                                                                   |                                                               |                                         | For the year ended December 31, |
|                                                                                   |                                                               |                                         | 2007                            | 2006      | 2005                                                        | 2004                                   | 2003           |
|                                                                                   |                                                               |                                         |                            |      |                                                        |                                   |           |
| Earnings before income taxes                                                           |     $ 994,870                             | $ 896,348                                    | $ 799,425                  | $ 526,991 |  $ 393,064                                             |
| Fixed charges                                                                          |                                                               | 93,240                                       | 62,546                          | 68,472    | 20,649                                                      |        20,865 |
| Earnings before income taxes and fixed charges                                         | $ 1,088,110                                                        | $ 958,894                                    | $ 867,897                       | $ 547,640 |    $ 413,929                            |
|                                                                                   |                                                               |                                         |                            |      |                                                        |                                   |           |
|                                                                                   |                                                               |                                         |                            |      |                                                        |                                   |           |
| Fixed charges:                                                                         |                                                               |                                         |                            |      |                                                        |                                   |
| Interest expense                                                                       |                                                               | $ 82,217                                     | $ 52,446                        | $ 58,414  | $ 14,301                                                    |    $ 15,051             |
| Portion of rental expense representative of interest factor                        (1) |           11,023 | 10,100                                       |     10,058       | 6,348     |          5,814 |
| Total fixed charges                                                                    |                                                               |       $ 93,240 |   $ 62,546       | $ 68,472  |   $ 20,649                                        |    $ 20,865                  |
|                                                                                   |                                                               |                                         |                            |      |                                                        |                                   |           |
| Ratio of earnings to fixed charges                                                     | 11.7                                                               | 15.3                                         | 12.7                            | 26.5      | 19.8                                                        |