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| Form | Report Date | Filing Date | Description |
|---|---|---|---|
| 8-K | 2025-03-07 | 2025-03-07 | FORM 8-K |
| 10-Q | 2024-09-30 | 2024-11-12 | 10-Q |
| 10-Q | 2024-06-30 | 2024-08-12 | 10-Q |
| 10-Q | 2024-03-31 | 2024-05-13 | 10-Q |
| 10-K | 2023-12-31 | 2024-04-01 | 10-K |
| 10-Q | 2023-09-30 | 2023-11-14 | 10-Q |
| 10-Q | 2023-06-30 | 2023-08-14 | 10-Q |
| 10-Q | 2023-03-31 | 2023-05-15 | 10-Q |
| 10-K | 2022-12-31 | 2023-03-24 | 10-K |
| 8-K | 2022-12-09 | 2022-12-15 | 8-K |
| 10-Q | 2022-09-30 | 2022-11-14 | 10-Q |
| 10-Q | 2022-06-30 | 2022-08-12 | 10-Q |
| 10-Q | 2022-03-31 | 2022-05-16 | 10-Q |
| 10-K | 2021-12-31 | 2022-03-22 | 10-K |
| 8-K | 2021-12-10 | 2021-12-10 | 8-K |
| 10-Q | 2021-09-30 | 2021-11-12 | 10-Q |
| 10-Q | 2021-06-30 | 2021-08-13 | 10-Q |
| 10-Q | 2021-03-31 | 2021-05-14 | 10-Q |
| 8-K | 2021-04-27 | 2021-04-27 | 8-K |
| 10-K | 2020-12-31 | 2021-03-19 | 10-K |
| 8-K | 2020-12-11 | 2020-12-11 | 8-K |
| 10-Q | 2020-09-30 | 2020-11-12 | 10-Q |
| 10-Q | 2020-06-30 | 2020-08-14 | 10-Q |
| 10-Q | 2020-03-31 | 2020-05-14 | 10-Q |
| 10-K | 2019-12-31 | 2020-03-19 | 10-K |
| 8-K | 2020-02-28 | 2020-02-28 | 8-K |
| 8-K | 2020-02-05 | 2020-02-05 | 8-K |
| 10-Q | 2019-09-30 | 2019-11-12 | 10-Q |
| 8-K | 2019-11-05 | 2019-11-05 | 8-K |
| 8-K | 2019-09-04 | 2019-09-04 | 8-K |
| 10-Q | 2019-06-30 | 2019-08-07 | 10-Q |
| 8-K | 2019-08-05 | 2019-08-05 | 8-K |
| 10-Q | 2019-03-31 | 2019-05-14 | CHKR 03.31.19 10-Q |
| 8-K | 2019-05-03 | 2019-05-03 | 8-K |
| 10-K | 2018-12-31 | 2019-03-22 | 10-K |
| 8-K | 2019-02-04 | 2019-02-04 | 8-K |
| 8-K | 2018-12-19 | 2018-12-19 | 8-K |
| 10-Q | 2018-09-30 | 2018-11-02 | 10-Q |
| 8-K | 2018-11-02 | 2018-11-02 | 8-K |
| 10-Q | 2018-06-30 | 2018-08-03 | 10-Q |
| 8-K | 2018-08-03 | 2018-08-03 | 8-K |
| 10-Q | 2018-03-31 | 2018-05-04 | 10-Q |
| 8-K | 2018-05-04 | 2018-05-04 | 8-K |
| 10-K | 2017-12-31 | 2018-03-21 | 10-K |
| 8-K | 2018-02-06 | 2018-02-06 | 8-K |
| 10-Q | 2017-09-30 | 2017-11-08 | 10-Q |
| 8-K | 2017-11-07 | 2017-11-07 | 8-K |
| 8-K | 2017-08-11 | 2017-08-11 | 8-K |
| 10-Q | 2017-06-30 | 2017-08-04 | 10-Q |
| 8-K | 2017-08-04 | 2017-08-04 | 8-K |
| 10-Q | 2017-03-31 | 2017-05-05 | 10-Q |
| 8-K | 2017-05-05 | 2017-05-05 | 8-K |
| 10-K | 2016-12-31 | 2017-03-30 | 10-K |
| 8-K | 2017-02-06 | 2017-02-06 | 8-K |
| 10-Q | 2016-09-30 | 2016-11-14 | 10-Q |
| 8-K | 2016-11-10 | 2016-11-10 | 8-K |
| 10-Q | 2016-06-30 | 2016-08-05 | 10-Q |
| 8-K | 2016-08-05 | 2016-08-05 | 8-K |
| 10-Q | 2016-03-31 | 2016-05-06 | 10-Q |
| 8-K | 2016-05-06 | 2016-05-06 | 8-K |
| 10-K | 2015-12-31 | 2016-03-10 | 10-K |
| 8-K | 2016-03-01 | 2016-03-01 | 8-K |
| 8-K | 2016-02-04 | 2016-02-04 | 8-K |
| 10-Q | 2015-09-30 | 2015-11-05 | 10-Q |
| 8-K | 2015-11-05 | 2015-11-05 | 8-K |
| 10-Q | 2015-06-30 | 2015-08-06 | 10-Q |
| 8-K | 2015-08-06 | 2015-08-06 | 8-K |
| 10-Q | 2015-03-31 | 2015-05-07 | 10-Q |
| 8-K | 2015-05-07 | 2015-05-07 | CURRENT REPORT OF MATERIAL EVENTS OR CORPORATE CHANGES |
| 10-K | 2014-12-31 | 2015-03-12 | 10-K |
| 8-K | 2015-02-05 | 2015-02-05 | 8-K |
| 10-Q | 2014-09-30 | 2014-11-06 | 10-Q |
| 8-K | 2014-11-06 | 2014-11-06 | CURRENT REPORT OF MATERIAL EVENTS OR CORPORATE CHANGES |
| 10-Q | 2014-06-30 | 2014-08-07 | 10-Q |
| 8-K | 2014-08-07 | 2014-08-07 | 8-K |
| 10-Q | 2014-03-31 | 2014-05-08 | 10-Q |
| 8-K | 2014-05-08 | 2014-05-08 | 8-K |
| 10-K | 2013-12-31 | 2014-03-14 | 10-K |
| 8-K | 2014-02-07 | 2014-02-07 | 8-K |
| 10-Q | 2013-09-30 | 2013-11-07 | 10-Q |
| 8-K | 2013-11-07 | 2013-11-07 | 8-K |
| 10-Q | 2013-06-30 | 2013-08-08 | 10-Q |
| 8-K | 2013-08-08 | 2013-08-08 | FORM 8-K |
| 8-K | 2013-05-09 | 2013-05-09 | FORM 8-K |
| 10-Q | 2013-03-31 | 2013-05-08 | 10-Q |
| 10-K | 2012-12-31 | 2013-03-15 | 10-K |
| 8-K | 2013-02-08 | 2013-02-08 | FORM 8-K |
| 10-Q | 2012-09-30 | 2012-11-14 | 10-Q |
| 8-K | 2012-11-07 | 2012-11-08 | FORM 8-K |
| 10-Q | 2012-06-30 | 2012-08-14 | FORM 10-Q |
| 8-K | 2012-08-10 | 2012-08-10 | FORM 8-K |
| 10-Q | 2012-03-31 | 2012-05-15 | FORM 10-Q |
| 8-K | 2012-05-10 | 2012-05-10 | FORM 8-K |
| 10-K | 2011-12-31 | 2012-03-30 | FORM 10-K |
| 8-K | 2012-02-08 | 2012-02-08 | FORM 8-K |
| 10-Q | 2011-09-30 | 2011-12-22 | FORM 10-Q |
| 8-K | 2011-12-05 | 2011-12-05 | FORM 8-K |
| 8-K | 2011-11-21 | 2011-11-21 | FORM 8-K |
| 8-K | 2011-11-10 | 2011-11-15 | FORM 8-K |