| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | FORM 4 | Aug 4, 2021 | Jul 30, 2021 | 000-28827 |
| 4 | Open Document | Open Filing | FORM 4 | Jan 14, 2021 | Jan 13, 2021 | 000-28827 |
| 4 | Open Document | Open Filing | FORM 4 | Dec 28, 2020 | Dec 24, 2020 | 000-28827 |
| 4 | Open Document | Open Filing | FORM 4 | Dec 18, 2020 | Dec 18, 2020 | 000-28827 |
| 4 | Open Document | Open Filing | FORM 4 | Nov 16, 2020 | Nov 12, 2020 | 000-28827 |
| 4 | Open Document | Open Filing | FORM 4 | Aug 4, 2020 | Jul 31, 2020 | 000-28827 |
| 4 | Open Document | Open Filing | FORM 4 | Jul 30, 2019 | Jul 26, 2019 | 000-28827 |
| 4 | Open Document | Open Filing | FORM 4 | Jul 31, 2018 | Jul 27, 2018 | 000-28827 |
| 4 | Open Document | Open Filing | FORM 4 | Jan 30, 2018 | Jan 29, 2018 | 000-28827 |
| 4 | Open Document | Open Filing | FORM 4 | Oct 31, 2017 | Oct 27, 2017 | 000-28827 |
| 4 | Open Document | Open Filing | FORM 4 | Jul 31, 2017 | Jul 28, 2017 | 000-28827 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 11, 2017 | May 10, 2017 | 000-28827 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 2, 2016 | Aug 1, 2016 | 000-28827 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 2, 2016 | Jul 29, 2016 | 000-28827 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 13, 2016 | May 11, 2016 | 001-13219 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 23, 2016 | Feb 22, 2016 | 000-28827 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Nov 24, 2015 | Nov 20, 2015 | 000-28827 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 11, 2015 | Aug 7, 2015 | 000-28827 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jul 28, 2015 | Jul 24, 2015 | 000-28827 |
| 4 | Open Document | Open Filing | FORM 4 | Jul 22, 2015 | Jul 21, 2015 | 001-33520 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jun 4, 2015 | Jun 2, 2015 | 001-13219 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 14, 2015 | Apr 13, 2015 | 000-28827 |
| 4/A | Open Document | Open Filing | OWNERSHIP DOCUMENT | Mar 27, 2015 | Mar 25, 2015 | 000-28827 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Mar 26, 2015 | Mar 25, 2015 | 000-28827 |
| 4 | Open Document | Open Filing | FORM 4 | Feb 27, 2015 | Feb 25, 2015 | 001-33520 |
| 4 | Open Document | Open Filing | FORM 4 | Feb 24, 2015 | Feb 23, 2015 | 001-33520 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 18, 2014 | Aug 15, 2014 | 000-28827 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 8, 2014 | Jul 25, 2014 | 000-28827 |
| 4 | Open Document | Open Filing | FORM 4 | Jul 23, 2014 | Jul 22, 2014 | 001-33520 |
| 4 | Open Document | Open Filing | May 16, 2014 | May 14, 2014 | 001-13219 |