| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jun 13, 2023 | Apr 1, 2022 | 001-13458 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 5, 2022 | Apr 1, 2022 | 001-13458 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Dec 2, 2021 | Dec 1, 2021 | 001-13458 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Dec 1, 2021 | Nov 30, 2021 | 001-13458 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 28, 2021 | Sep 10, 2021 | 001-13458 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Oct 6, 2020 | Oct 2, 2020 | 001-13458 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 1, 2020 | Aug 28, 2020 | 001-13458 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 18, 2019 | Nov 14, 2019 | 001-13458 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jul 6, 2018 | Jun 28, 2018 | 001-13458 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 11, 2015 | Dec 9, 2015 | 001-13458 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 1, 2015 | Aug 31, 2015 | 001-13458 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 15, 2015 | Apr 13, 2015 | 001-13458 |