| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | May 3, 2023 | May 1, 2023 | 000-14939 | |
| 4 | Open Document | Open Filing | May 4, 2022 | May 2, 2022 | 000-14939 | |
| 4 | Open Document | Open Filing | May 4, 2021 | May 3, 2021 | 000-14939 | |
| 4 | Open Document | Open Filing | Mar 8, 2021 | Mar 5, 2021 | 000-14939 | |
| 4 | Open Document | Open Filing | Feb 8, 2021 | Feb 5, 2021 | 000-14939 | |
| 4 | Open Document | Open Filing | Jan 5, 2021 | Jan 5, 2021 | 000-14939 | |
| 4 | Open Document | Open Filing | Dec 8, 2020 | Dec 7, 2020 | 000-14939 | |
| 4 | Open Document | Open Filing | Nov 9, 2020 | Nov 9, 2020 | 000-14939 | |
| 4 | Open Document | Open Filing | Sep 11, 2020 | Sep 10, 2020 | 000-14939 | |
| 4 | Open Document | Open Filing | Aug 6, 2020 | Aug 5, 2020 | 000-14939 | |
| 4 | Open Document | Open Filing | May 5, 2020 | May 1, 2020 | 000-14939 | |
| 4 | Open Document | Open Filing | Sep 4, 2019 | Sep 3, 2019 | 000-14939 | |
| 4 | Open Document | Open Filing | Aug 2, 2019 | Aug 1, 2019 | 000-14939 | |
| 4 | Open Document | Open Filing | Jul 8, 2019 | Jul 3, 2019 | 000-14939 | |
| 4 | Open Document | Open Filing | Jul 3, 2019 | Jul 1, 2019 | 000-14939 | |
| 4 | Open Document | Open Filing | Jun 3, 2019 | Jun 3, 2019 | 000-14939 | |
| 4 | Open Document | Open Filing | May 2, 2019 | May 1, 2019 | 000-14939 | |
| 4 | Open Document | Open Filing | Apr 1, 2019 | Apr 1, 2019 | 000-14939 | |
| 4 | Open Document | Open Filing | Feb 28, 2019 | Feb 27, 2019 | 000-14939 | |
| 4 | Open Document | Open Filing | Feb 26, 2019 | Feb 21, 2019 | 000-14939 | |
| 4 | Open Document | Open Filing | Aug 22, 2018 | Aug 20, 2018 | 000-14939 | |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 29, 2018 | May 24, 2018 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 25, 2018 | May 23, 2018 | 000-14939 |
| 4 | Open Document | Open Filing | FORM 4 | Apr 3, 2018 | Mar 30, 2018 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Mar 6, 2018 | Mar 5, 2018 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Mar 1, 2018 | Feb 27, 2018 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Oct 4, 2017 | Oct 2, 2017 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Sep 6, 2017 | Sep 1, 2017 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 3, 2017 | Aug 1, 2017 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jul 12, 2017 | Jul 11, 2017 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jul 10, 2017 | Jul 6, 2017 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jun 19, 2017 | Jun 15, 2017 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jun 5, 2017 | Jun 1, 2017 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 30, 2017 | May 25, 2017 | 000-14939 |
| 4 | Open Document | Open Filing | FORM 4 | May 2, 2017 | Apr 28, 2017 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 26, 2017 | Apr 24, 2017 | 000-14939 |
| SC 13G/A | Open Document | Open Filing | AMENDMENT NO. 1 | Feb 13, 2017 | ||
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 10, 2017 | Feb 8, 2017 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jan 12, 2017 | Jan 9, 2017 | 000-14939 |
| 4/A | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jan 11, 2017 | Dec 8, 2016 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Dec 12, 2016 | Dec 8, 2016 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Nov 30, 2016 | Nov 29, 2016 | 000-14939 |
| 4 | Open Document | Open Filing | FORM 4 | Nov 22, 2016 | Nov 18, 2016 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Oct 21, 2016 | Oct 20, 2016 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Sep 26, 2016 | Sep 23, 2016 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Sep 22, 2016 | Sep 20, 2016 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 30, 2016 | Aug 29, 2016 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 24, 2016 | Aug 23, 2016 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 7, 2015 | Aug 5, 2015 | 000-14939 |
| SC 13G | Open Document | Open Filing | SC 13G | Jul 13, 2015 | ||
| 4 | Open Document | Open Filing | FORM 4 | Jun 24, 2015 | Jun 22, 2015 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 22, 2015 | May 20, 2015 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 4, 2015 | Apr 30, 2015 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 21, 2015 | Apr 20, 2015 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Mar 20, 2015 | Mar 20, 2015 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 23, 2015 | Feb 20, 2015 | 000-14939 |
| 4 | Open Document | Open Filing | FORM 4 | Jan 22, 2015 | Jan 20, 2015 | 000-14939 |
| 4 | Open Document | Open Filing | FOR YOUR REVIEW | Dec 23, 2014 | Dec 22, 2014 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Nov 21, 2014 | Nov 20, 2014 | 000-14939 |
| 4 | Open Document | Open Filing | FORM 4 | Oct 21, 2014 | Oct 20, 2014 | 000-14939 |
| 4 | Open Document | Open Filing | FORM 4 | Sep 24, 2014 | Sep 23, 2014 | 000-14939 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 26, 2014 | Aug 22, 2014 | 000-14939 |