| Quarterly report | 10-Q | 2000-11-09 | 2000-09-30 |
| Quarterly report | 10-Q | 2000-08-10 | 2000-06-30 |
| Employee stock plan | S-8 | 2000-07-26 | - |
| Major company event | 8-K | 2000-07-21 | 2000-07-21 |
| Activist ownership stake (update) | SC 13D/A | 2000-07-05 | - |
| Quarterly report | 10-Q | 2000-05-12 | 2000-03-31 |
| Proxy statement | DEF 14A | 2000-03-27 | 2000-05-09 |
| Annual report | 10-K | 2000-03-27 | 1999-12-31 |
| Passive ownership stake | SC 13G | 2000-02-14 | - |
| Passive ownership stake (update) | SC 13G/A | 2000-02-14 | - |
| Passive ownership stake | SC 13G | 2000-02-11 | - |
| Passive ownership stake (update) | SC 13G/A | 2000-02-10 | - |
| Passive ownership stake (update) | SC 13G/A | 2000-02-07 | - |
| Major company event (amended) | 8-K/A | 2000-01-20 | 1999-11-09 |
| Activist ownership stake (update) | SC 13D/A | 2000-01-05 | - |
| Quarterly report | 10-Q | 1999-11-12 | 1999-09-30 |
| Major company event | 8-K | 1999-11-12 | 1999-11-09 |
| Activist ownership stake (update) | SC 13D/A | 1999-11-09 | - |
| Quarterly report | 10-Q | 1999-08-12 | 1999-06-30 |
| Activist ownership stake (update) | SC 13D/A | 1999-08-12 | - |
| Passive ownership stake | SC 13G | 1999-06-10 | - |
| Insider trade | 4 | 1999-06-09 | 1999-05-31 |
| Activist ownership stake (update) | SC 13D/A | 1999-06-09 | - |
| Quarterly report | 10-Q | 1999-05-11 | 1999-03-31 |
| Proxy statement | DEF 14A | 1999-03-30 | 1999-05-11 |
| Annual report | 10-K | 1999-03-26 | 1998-12-31 |
| Passive ownership stake (update) | SC 13G/A | 1999-02-18 | - |
| Passive ownership stake | SC 13G | 1999-02-16 | - |
| Passive ownership stake (update) | SC 13G/A | 1999-02-10 | - |
| Insider trade | 4 | 1999-01-11 | 1998-12-01 |
| Insider trade | 4 | 1998-12-04 | 1998-11-01 |
| New insider ownership | 3 | 1998-12-04 | 1998-07-28 |
| Activist ownership stake (update) | SC 13D/A | 1998-11-25 | - |
| Quarterly report | 10-Q | 1998-11-10 | 1998-09-30 |
| S-4/A | - | 1998-10-01 | - |
| Quarterly report | 10-Q | 1998-08-13 | 1998-06-30 |
| Passive ownership stake | SC 13G | 1998-08-10 | - |
| Activist ownership stake (update) | SC 13D/A | 1998-08-05 | - |
| S-4 | - | 1998-07-10 | - |
| Quarterly report | 10-Q | 1998-06-29 | 1998-03-31 |
| Activist ownership stake (update) | SC 13D/A | 1998-06-11 | - |
| Passive ownership stake | SC 13G | 1998-06-09 | - |
| Activist ownership stake | SC 13D | 1998-06-08 | - |
| 10-12B/A | - | 1998-05-04 | - |
| 10-12B/A | - | 1998-04-21 | - |
| 10-12B | - | 1998-04-10 | - |
| RW | - | 1998-04-09 | - |
| 10-12B/A | - | 1998-04-06 | - |
| 10-12B | - | 1998-02-13 | - |
