| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 3, 2021 | Aug 3, 2021 | 001-09876 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 3, 2021 | Apr 29, 2021 | 001-09876 |
| 5 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 11, 2021 | Dec 31, 2020 | 001-09876 |
| 4 | Open Document | Open Filing | FORM 4 | Dec 23, 2020 | Dec 22, 2020 | 000-19424 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 5, 2020 | Nov 5, 2020 | 001-09876 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 4, 2020 | Aug 3, 2020 | 001-09876 |
| 5 | Open Document | Open Filing | PRIMARY DOCUMENT | Jan 30, 2020 | Dec 31, 2019 | 001-09876 |
| 4 | Open Document | Open Filing | FORM 4 | Dec 13, 2019 | Dec 11, 2019 | 000-19424 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 20, 2019 | Aug 19, 2019 | 001-09876 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 3, 2019 | May 2, 2019 | 001-09876 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Apr 25, 2019 | Apr 24, 2019 | 000-19424 |
| 3 | Open Document | Open Filing | FORM 3 SUBMISSION | Apr 16, 2019 | Apr 9, 2019 | 000-19424 |
| 5 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 5, 2019 | Dec 31, 2018 | 001-09876 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 1, 2018 | Apr 27, 2018 | 001-09876 |
| 5 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 9, 2018 | Dec 31, 2017 | 001-09876 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 2, 2017 | Apr 28, 2017 | 001-09876 |
| 5 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 6, 2017 | Dec 31, 2016 | 001-09876 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 28, 2016 | Apr 27, 2016 | 001-09876 |
| 5 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 5, 2016 | Dec 31, 2015 | 001-09876 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 4, 2015 | May 1, 2015 | 001-09876 |
| 5 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 10, 2015 | Dec 31, 2014 | 001-09876 |
| 4/A | Open Document | Open Filing | PRIMARY DOCUMENT | May 2, 2014 | Apr 29, 2014 | 001-09876 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 1, 2014 | Apr 29, 2014 | 001-09876 |
| 5 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 7, 2014 | Dec 31, 2013 | 001-09876 |
| 3 | Open Document | Open Filing | PRIMARY DOCUMENT | Jan 21, 2014 | Jan 21, 2014 | 000-55106 |