| Insider trade | 4 | 2017-11-13 | 2017-11-09 |
| Activist ownership stake (update) | SC 13D/A | 2017-11-03 | - |
| Major company event | 8-K | 2017-11-02 | 2017-11-02 |
| Quarterly report | 10-Q | 2017-11-02 | 2017-09-30 |
| Activist ownership stake (update) | SC 13D/A | 2017-09-22 | - |
| Major company event | 8-K | 2017-09-21 | 2017-09-20 |
| Passive ownership stake (update) | SC 13G/A | 2017-09-11 | - |
| Activist ownership stake (update) | SC 13D/A | 2017-08-28 | - |
| Major company event | 8-K | 2017-08-03 | 2017-08-03 |
| Quarterly report | 10-Q | 2017-08-03 | 2017-06-30 |
| Activist ownership stake (update) | SC 13D/A | 2017-07-18 | - |
| Major company event | 8-K | 2017-07-14 | 2017-07-11 |
| Insider trade | 4 | 2017-07-06 | 2017-07-03 |
| Insider trade | 4 | 2017-07-06 | 2017-07-03 |
| Employee plan annual report | 11-K | 2017-06-29 | 2016-12-31 |
| Passive ownership stake | SC 13G | 2017-06-12 | - |
| Passive ownership stake (update) | SC 13G/A | 2017-06-12 | - |
| Insider trade | 4 | 2017-06-09 | 2017-06-09 |
| New insider ownership | 3 | 2017-06-05 | 2017-05-25 |
| Activist ownership stake (update) | SC 13D/A | 2017-05-31 | - |
| Major company event | 8-K | 2017-05-30 | 2017-05-25 |
| Insider trade | 4 | 2017-05-24 | 2017-05-23 |
| Major company event | 8-K | 2017-05-04 | 2017-05-04 |
| Quarterly report | 10-Q | 2017-05-04 | 2017-03-31 |
| Activist ownership stake (update) | SC 13D/A | 2017-04-26 | - |
| Proxy materials | DEFA14A | 2017-04-14 | - |
| Proxy statement | DEF 14A | 2017-04-14 | 2017-05-25 |
| Major company event | 8-K | 2017-03-14 | 2017-03-13 |
| Major company event | 8-K | 2017-03-02 | 2017-03-02 |
| Annual report | 10-K | 2017-03-02 | 2016-12-31 |
| Passive ownership stake (update) | SC 13G/A | 2017-02-13 | - |
| Passive ownership stake (update) | SC 13G/A | 2017-02-13 | - |
| Passive ownership stake (update) | SC 13G/A | 2017-01-17 | - |
| Major company event | 8-K | 2016-12-29 | 2016-12-27 |
| Major company event | 8-K | 2016-11-03 | 2016-11-03 |
| Quarterly report | 10-Q | 2016-11-03 | 2016-09-30 |
| Major company event | 8-K | 2016-08-03 | 2016-08-03 |
| Quarterly report | 10-Q | 2016-08-03 | 2016-06-30 |
| Employee plan annual report | 11-K | 2016-06-28 | 2015-12-31 |
| Major company event | 8-K | 2016-05-19 | 2016-05-17 |
| Insider trade | 4 | 2016-05-18 | 2016-05-17 |
| Insider trade | 4 | 2016-05-18 | 2016-05-17 |
| Insider trade | 4 | 2016-05-18 | 2016-05-17 |
| Employee stock plan | S-8 | 2016-05-06 | - |
| Quarterly report | 10-Q | 2016-05-06 | 2016-03-31 |
| Major company event | 8-K | 2016-05-05 | 2016-05-05 |
| SEC correspondence | UPLOAD | 2016-05-02 | - |
| Company correspondence | CORRESP | 2016-04-22 | - |
| SEC correspondence | UPLOAD | 2016-04-08 | - |
| Proxy materials | DEFA14A | 2016-04-06 | - |
