| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 20 May 2021 | 18 May 2021 | 001-32731 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 21 May 2020 | 19 May 2020 | 001-32731 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 22 May 2019 | 21 May 2019 | 001-32731 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 23 May 2018 | 22 May 2018 | 001-32731 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 23 Feb 2018 | 22 Feb 2018 | 001-32731 |
| 3 | Open Document | Open Filing | FORM 3 SUBMISSION | 19 Dec 2016 | 16 Dec 2016 | 001-32731 |