| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 13 Jul 2021 | 23 Feb 2021 | 001-11993 |
| 3 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 07 Aug 2019 | 06 Aug 2019 | 001-11993 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 23 Jul 2015 | 23 Jul 2015 | 000-52073 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 11 Mar 2015 | 09 Mar 2015 | 000-52073 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 10 Mar 2015 | 06 Mar 2015 | 000-52073 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 06 Mar 2015 | 04 Mar 2015 | 000-52073 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 01 Aug 2014 | 30 Jul 2014 | 000-52073 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 28 Mar 2014 | 26 Mar 2014 | 000-52073 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 11 Mar 2014 | 09 Mar 2014 | 000-52073 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 07 Mar 2014 | 05 Mar 2014 | 000-52073 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 02 Aug 2013 | 01 Aug 2013 | 000-52073 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 06 Jun 2013 | 04 Jun 2013 | 000-52073 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 12 Mar 2013 | 09 Mar 2013 | 000-52073 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 08 Mar 2013 | 06 Mar 2013 | 000-52073 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 12 Dec 2012 | 10 Dec 2012 | 000-52073 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 06 Jun 2012 | 04 Jun 2012 | 000-52073 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 21 Mar 2012 | 19 Mar 2012 | 000-52073 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 13 Mar 2012 | 06 Mar 2012 | 000-52073 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 08 Mar 2012 | 06 Mar 2012 | 000-52073 |