| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | FORM 4 | Sep 17, 2021 | Sep 17, 2021 | 000-20908 |
| 4 | Open Document | Open Filing | FORM 4 | May 6, 2021 | May 5, 2021 | 000-20908 |
| 4 | Open Document | Open Filing | FORM 4 | Jan 27, 2021 | Jan 26, 2021 | 000-20908 |
| 4 | Open Document | Open Filing | FORM 4 | Mar 19, 2020 | Mar 18, 2020 | 000-20908 |
| 4 | Open Document | Open Filing | FORM 4 | Mar 21, 2019 | Mar 20, 2019 | 000-20908 |
| 4 | Open Document | Open Filing | FORM 4 | Nov 27, 2018 | Nov 23, 2018 | 000-20908 |
| 4 | Open Document | Open Filing | FORM 4 | May 29, 2018 | May 25, 2018 | 000-20908 |
| 4 | Open Document | Open Filing | FORM 4 | May 15, 2018 | May 14, 2018 | 000-20908 |
| 4 | Open Document | Open Filing | FORM 4 | Mar 22, 2018 | Mar 21, 2018 | 000-20908 |
| 4 | Open Document | Open Filing | FORM 4 | Nov 20, 2017 | Nov 17, 2017 | 000-20908 |
| 4 | Open Document | Open Filing | FORM 4 | Mar 16, 2017 | Mar 15, 2017 | 000-20908 |
| 4 | Open Document | Open Filing | FORM 4 | Mar 13, 2017 | Mar 9, 2017 | 000-20908 |
| 4 | Open Document | Open Filing | FORM 4 | Nov 14, 2016 | Nov 11, 2016 | 000-20908 |
| 4 | Open Document | Open Filing | FORM 4 | Jun 10, 2016 | Jun 9, 2016 | 000-20908 |
| 4 | Open Document | Open Filing | FORM 4 | Jun 9, 2016 | Jun 8, 2016 | 000-20908 |
| 4 | Open Document | Open Filing | FORM 4 | Mar 17, 2016 | Mar 16, 2016 | 000-20908 |
| 4 | Open Document | Open Filing | FORM 4 | Dec 3, 2015 | Dec 1, 2015 | 000-20908 |
| 4 | Open Document | Open Filing | FORM 4 | Jul 10, 2015 | Jul 9, 2015 | 000-20908 |
| 4 | Open Document | Open Filing | FORM 4 | Jun 11, 2015 | Jun 11, 2015 | 000-20908 |
| 4 | Open Document | Open Filing | FORM 4 | Mar 19, 2015 | Mar 18, 2015 | 000-20908 |
| 4 | Open Document | Open Filing | FORM 4 | Dec 12, 2014 | Dec 11, 2014 | 000-20908 |
| 4 | Open Document | Open Filing | FORM 4 | Nov 26, 2014 | Nov 25, 2014 | 000-20908 |
| 4 | Open Document | Open Filing | FORM 4 | Nov 18, 2014 | Nov 14, 2014 | 000-20908 |
| 4 | Open Document | Open Filing | FORM 4 | Nov 14, 2014 | Nov 12, 2014 | 000-20908 |
| 4 | Open Document | Open Filing | FORM 4 | Jul 2, 2014 | Jul 1, 2014 | 000-20908 |
| 4 | Open Document | Open Filing | FORM 4 | Jun 11, 2014 | Jun 10, 2014 | 000-20908 |
| 4 | Open Document | Open Filing | FORM 4 | Mar 20, 2014 | Mar 19, 2014 | 000-20908 |