| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jul 13, 2021 | Feb 23, 2021 | 001-11993 |
| 3 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 7, 2019 | Aug 6, 2019 | 001-11993 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Jul 23, 2015 | Jul 23, 2015 | 000-52073 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Mar 11, 2015 | Mar 9, 2015 | 000-52073 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Mar 10, 2015 | Mar 6, 2015 | 000-52073 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Mar 6, 2015 | Mar 4, 2015 | 000-52073 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Aug 1, 2014 | Jul 30, 2014 | 000-52073 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Mar 28, 2014 | Mar 26, 2014 | 000-52073 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Mar 11, 2014 | Mar 9, 2014 | 000-52073 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Mar 7, 2014 | Mar 5, 2014 | 000-52073 |