| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jun 22, 2021 | Jun 21, 2021 | 000-23071 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 6, 2019 | May 3, 2019 | 000-23071 |
| 4 | Open Document | Open Filing | FORM 4 | Apr 3, 2019 | Apr 2, 2019 | 000-23071 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Mar 22, 2019 | Mar 21, 2019 | 000-23071 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jun 1, 2018 | May 31, 2018 | 000-23071 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 8, 2018 | May 4, 2018 | 000-23071 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 6, 2018 | Apr 5, 2018 | 000-23071 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Mar 26, 2018 | Mar 22, 2018 | 000-23071 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 26, 2017 | May 25, 2017 | 000-23071 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 9, 2017 | May 5, 2017 | 000-23071 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Mar 27, 2017 | Mar 23, 2017 | 000-23071 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 9, 2016 | May 5, 2016 | 000-23071 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 21, 2016 | Apr 19, 2016 | 000-23071 |
| 4 | Open Document | Open Filing | FORM 4 | Mar 29, 2016 | Mar 24, 2016 | 000-23071 |
| 4 | Open Document | Open Filing | FORM 4 | Sep 1, 2015 | Aug 31, 2015 | 000-23071 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 8, 2015 | May 6, 2015 | 000-23071 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 7, 2015 | May 6, 2015 | 000-23071 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 24, 2015 | Apr 22, 2015 | 000-23071 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 23, 2015 | Apr 21, 2015 | 000-23071 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jul 21, 2014 | May 5, 2014 | 000-23071 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 23, 2014 | Apr 21, 2014 | 000-23071 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 17, 2014 | Apr 16, 2014 | 000-23071 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Mar 21, 2014 | Mar 20, 2014 | 000-23071 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jan 7, 2014 | Jan 6, 2014 | 000-23071 |