| Quarterly report | 10-Q | 2001-05-07 | 2001-03-31 |
| 10-K405 | - | 2001-04-02 | 2000-12-31 |
| Passive ownership stake (update) | SC 13G/A | 2001-02-13 | - |
| Employee stock plan | S-8 | 2001-01-16 | - |
| Quarterly report | 10-Q | 2000-11-14 | 2000-09-30 |
| Quarterly report | 10-Q | 2000-08-14 | 2000-06-30 |
| Proxy statement | DEF 14A | 2000-06-14 | 2000-06-29 |
| Quarterly report | 10-Q | 2000-05-15 | 2000-03-31 |
| Annual report (amended) | 10-K/A | 2000-04-28 | 1999-12-31 |
| Major company event | 8-K | 2000-04-27 | 2000-04-26 |
| Annual report | 10-K | 2000-04-03 | 1999-12-31 |
| NT 10-K | - | 2000-03-31 | 1999-12-31 |
| Passive ownership stake (update) | SC 13G/A | 2000-02-11 | - |
| Quarterly report | 10-Q | 1999-11-12 | 1999-09-30 |
| Employee stock plan | S-8 | 1999-10-26 | - |
| Quarterly report (amended) | 10-Q/A | 1999-08-13 | 1999-03-31 |
| Quarterly report | 10-Q | 1999-08-13 | 1999-06-30 |
| Annual report (amended) | 10-K/A | 1999-08-13 | 1998-12-31 |
| Major company event | 8-K | 1999-06-08 | 1999-05-28 |
| Proxy statement | DEF 14A | 1999-06-03 | 1999-06-21 |
| Quarterly report | 10-Q | 1999-05-17 | 1999-03-31 |
| Annual report | 10-K | 1999-04-16 | 1998-12-31 |
| NT 10-K | - | 1999-04-01 | 1998-12-31 |
| Passive ownership stake (update) | SC 13G/A | 1999-03-18 | - |
| Passive ownership stake | SC 13G | 1999-02-08 | - |
| Quarterly report (amended) | 10-Q/A | 1999-01-20 | 1998-06-30 |
| Quarterly report | 10-Q | 1999-01-20 | 1998-09-30 |
| Quarterly report (amended) | 10-Q/A | 1999-01-20 | 1998-03-31 |
| Quarterly report (amended) | 10-Q/A | 1999-01-20 | 1997-06-30 |
| Quarterly report (amended) | 10-Q/A | 1999-01-20 | 1997-03-31 |
| Major company event | 8-K | 1999-01-08 | 1999-01-04 |
| Major company event | 8-K | 1998-11-24 | 1998-11-23 |
| NT 10-Q | - | 1998-11-17 | 1998-09-30 |
| Quarterly report | 10-Q | 1998-08-14 | 1998-06-30 |
| Quarterly report | 10-Q | 1998-05-15 | 1998-03-31 |
| Proxy statement | DEF 14A | 1998-04-28 | 1998-05-06 |
| Annual report | 10-K | 1998-04-15 | 1997-12-31 |
| Quarterly report (amended) | 10-Q/A | 1998-04-15 | 1997-06-30 |
| Quarterly report (amended) | 10-Q/A | 1998-04-15 | 1997-09-30 |
| Quarterly report (amended) | 10-Q/A | 1998-04-15 | 1997-03-31 |
| NT 10-K | - | 1998-04-01 | 1997-12-31 |
| Passive ownership stake (update) | SC 13G/A | 1998-02-17 | - |
| Major company event | 8-K | 1997-12-16 | 1997-12-10 |
| Quarterly report (amended) | 10-Q/A | 1997-11-21 | 1997-06-30 |
| Quarterly report | 10-Q | 1997-11-19 | 1997-09-30 |
| Quarterly report (amended) | 10-Q/A | 1997-11-19 | 1997-06-30 |
| Major company event (amended) | 8-K/A | 1997-11-18 | 1997-11-14 |
| NT 10-Q | - | 1997-11-14 | 1997-09-30 |
| Major company event | 8-K | 1997-11-06 | 1997-10-30 |
| Quarterly report | 10-Q | 1997-08-14 | 1997-06-30 |
