| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 30, 2021 | Aug 27, 2021 | 001-10879 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 24, 2021 | May 20, 2021 | 001-10879 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 3, 2020 | Jul 31, 2020 | 001-10879 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 22, 2020 | May 21, 2020 | 001-10879 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 5, 2019 | Nov 5, 2019 | 001-10879 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 24, 2019 | May 23, 2019 | 001-10879 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 5, 2019 | Mar 4, 2019 | 001-10879 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 22, 2018 | May 18, 2018 | 001-10879 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 5, 2017 | Jun 2, 2017 | 001-10879 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 23, 2017 | May 19, 2017 | 001-10879 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jul 26, 2016 | Jul 26, 2016 | 001-10879 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 27, 2016 | May 26, 2016 | 001-10879 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 22, 2015 | May 21, 2015 | 001-10879 |
| 3/A | Open Document | Open Filing | PRIMARY DOCUMENT | Jan 9, 2015 | Jan 1, 2015 | 001-10879 |
| 3 | Open Document | Open Filing | PRIMARY DOCUMENT | Jan 5, 2015 | Jan 1, 2015 | 001-10879 |