| Employee plan annual report | 11-K | 2000-06-28 | 1999-12-31 |
| Employee plan annual report | 11-K | 2000-06-28 | 1999-12-31 |
| Insider trade | 4 | 2000-06-08 | 2000-05-30 |
| Quarterly report | 10-Q | 2000-05-12 | 2000-03-21 |
| Annual report | 10-K | 2000-03-17 | 1999-12-31 |
| Proxy statement | DEF 14A | 2000-03-14 | 2000-04-20 |
| Insider trade | 4 | 2000-03-07 | 2000-02-29 |
| Passive ownership stake (update) | SC 13G/A | 2000-02-11 | - |
| Passive ownership stake | SC 13G | 2000-02-11 | - |
| Insider trade | 4 | 2000-02-07 | 2000-01-31 |
| Activist ownership stake (update) | SC 13D/A | 2000-02-07 | - |
| Insider trade | 4 | 2000-01-10 | 1999-12-31 |
| Insider trade | 4 | 1999-12-07 | 1999-11-30 |
| Activist ownership stake (update) | SC 13D/A | 1999-11-30 | - |
| Quarterly report | 10-Q | 1999-11-12 | 1999-09-30 |
| Insider trade | 4 | 1999-11-09 | 1999-11-08 |
| Insider trade | 4 | 1999-10-07 | 1999-09-01 |
| Activist ownership stake (update) | SC 13D/A | 1999-09-20 | - |
| Insider trade | 4 | 1999-09-10 | 1999-08-31 |
| Quarterly report | 10-Q | 1999-08-13 | 1999-06-30 |
| Insider trade | 4 | 1999-08-09 | 1999-08-06 |
| Activist ownership stake (update) | SC 13D/A | 1999-07-20 | - |
| Insider trade | 4 | 1999-07-19 | 1999-07-19 |
| Major company event | 8-K | 1999-07-02 | 1999-07-01 |
| S-4 POS | - | 1999-07-01 | - |
| Employee plan annual report | 11-K | 1999-06-25 | 1998-12-31 |
| Employee plan annual report | 11-K | 1999-06-25 | 1998-12-31 |
| Major company event | 8-K | 1999-06-11 | 1999-06-10 |
| Prospectus supplement | 424B2 | 1999-06-11 | - |
| S-3/A | - | 1999-05-18 | - |
| Quarterly report | 10-Q | 1999-05-14 | 1999-03-31 |
| 424B3 | - | 1999-04-21 | - |
| Securities registration | S-3 | 1999-04-19 | - |
| S-4 | - | 1999-04-14 | - |
| Employee stock plan | S-8 | 1999-04-01 | - |
| Annual report | 10-K | 1999-03-17 | 1998-12-31 |
| Major company event | 8-K | 1999-02-26 | 1999-02-25 |
| Proxy statement | DEF 14A | 1999-02-26 | 1999-04-15 |
| Passive ownership stake | SC 13G | 1999-02-11 | - |
| Passive ownership stake | SC 13G | 1999-02-09 | - |
| Passive ownership stake | SC 13G | 1999-02-09 | - |
| Major company event (amended) | 8-K/A | 1998-12-30 | 1998-11-01 |
| Quarterly report | 10-Q | 1998-11-13 | 1998-09-30 |
| Activist ownership stake | SC 13D | 1998-11-10 | - |
| Major company event | 8-K | 1998-11-05 | 1998-11-01 |
| 8-A12B | - | 1998-10-30 | - |
| Major company event | 8-K | 1998-09-22 | 1998-09-21 |
| Quarterly report | 10-Q | 1998-08-14 | 1998-06-30 |
| DEFM14A | - | 1998-07-20 | - |
| Passive ownership stake | SC 13G | 1998-07-09 | - |
