Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000859598-18-000070-index-headers.html | 2018-07-25 17:02:34 | |
| 0000859598-18-000070-index.html | 2018-07-25 17:02:34 | |
| 0000859598-18-000070.txt | 2018-07-25 17:02:34 | |
 0000859598-18-000070-xbrl.zip | 257609 | 2018-07-25 17:02:34 |
| chk-06302018xex101formofex.htm | 220764 | 2018-07-25 17:02:34 |
| ckh-06302018x10q.htm | 2291900 | 2018-07-25 17:02:34 |
| ckh-06302018xex311.htm | 13004 | 2018-07-25 17:02:34 |
| ckh-06302018xex312.htm | 12987 | 2018-07-25 17:02:34 |
| ckh-06302018xex321.htm | 5394 | 2018-07-25 17:02:34 |
| ckh-06302018xex322.htm | 5128 | 2018-07-25 17:02:34 |
| ckh-20180630.xml | 2933943 | 2018-07-25 17:02:34 |
| ckh-20180630.xsd | 47090 | 2018-07-25 17:02:34 |
| ckh-20180630_cal.xml | 86566 | 2018-07-25 17:02:34 |
| ckh-20180630_def.xml | 263723 | 2018-07-25 17:02:34 |
| ckh-20180630_lab.xml | 688751 | 2018-07-25 17:02:34 |
| ckh-20180630_pre.xml | 409656 | 2018-07-25 17:02:34 |
| FilingSummary.xml | 34570 | 2018-07-25 17:02:34 |
| Financial_Report.xlsx | 88401 | 2018-07-25 17:02:34 |
| R1.htm | 25777 | 2018-07-25 17:02:34 |
| R10.htm | 7867 | 2018-07-25 17:02:34 |
| R11.htm | 11404 | 2018-07-25 17:02:34 |
| R12.htm | 22292 | 2018-07-25 17:02:34 |
| R13.htm | 12049 | 2018-07-25 17:02:34 |
| R14.htm | 25199 | 2018-07-25 17:02:34 |
| R15.htm | 25662 | 2018-07-25 17:02:34 |
| R16.htm | 5991 | 2018-07-25 17:02:34 |
| R17.htm | 13820 | 2018-07-25 17:02:34 |
| R18.htm | 32759 | 2018-07-25 17:02:34 |
| R19.htm | 657581 | 2018-07-25 17:02:34 |
| R2.htm | 97664 | 2018-07-25 17:02:34 |
| R20.htm | 70427 | 2018-07-25 17:02:34 |
| R21.htm | 243217 | 2018-07-25 17:02:34 |
| R22.htm | 11898 | 2018-07-25 17:02:34 |
| R23.htm | 109674 | 2018-07-25 17:02:34 |
| R24.htm | 34014 | 2018-07-25 17:02:34 |
| R25.htm | 22895 | 2018-07-25 17:02:34 |
| R26.htm | 13244 | 2018-07-25 17:02:34 |
| R27.htm | 16855 | 2018-07-25 17:02:34 |
| R28.htm | 657127 | 2018-07-25 17:02:34 |
| R29.htm | 73358 | 2018-07-25 17:02:34 |
| R3.htm | 21429 | 2018-07-25 17:02:34 |
| R30.htm | 4311 | 2018-07-25 17:02:34 |
| R31.htm | 5925 | 2018-07-25 17:02:34 |
| R32.htm | 10102 | 2018-07-25 17:02:34 |
| R33.htm | 24041 | 2018-07-25 17:02:34 |
| R34.htm | 10707 | 2018-07-25 17:02:34 |
| R35.htm | 4924 | 2018-07-25 17:02:34 |
| R36.htm | 13867 | 2018-07-25 17:02:34 |
| R37.htm | 40654 | 2018-07-25 17:02:34 |
| R38.htm | 38502 | 2018-07-25 17:02:34 |
| R39.htm | 25542 | 2018-07-25 17:02:34 |
| R4.htm | 94290 | 2018-07-25 17:02:34 |
| R40.htm | 36062 | 2018-07-25 17:02:34 |
| R41.htm | 97024 | 2018-07-25 17:02:34 |
| R42.htm | 24266 | 2018-07-25 17:02:34 |
| R43.htm | 10847 | 2018-07-25 17:02:34 |
| R44.htm | 19334 | 2018-07-25 17:02:34 |
| R45.htm | 23129 | 2018-07-25 17:02:34 |
| R46.htm | 35852 | 2018-07-25 17:02:34 |
| R47.htm | 5930 | 2018-07-25 17:02:34 |
| R48.htm | 23207 | 2018-07-25 17:02:34 |
| R49.htm | 31421 | 2018-07-25 17:02:34 |
| R5.htm | 34835 | 2018-07-25 17:02:34 |
| R50.htm | 175462 | 2018-07-25 17:02:34 |
| R51.htm | 78901 | 2018-07-25 17:02:34 |
| R52.htm | 50435 | 2018-07-25 17:02:34 |
| R6.htm | 48788 | 2018-07-25 17:02:34 |
| R7.htm | 74213 | 2018-07-25 17:02:34 |
| R8.htm | 121809 | 2018-07-25 17:02:34 |
| R9.htm | 33968 | 2018-07-25 17:02:34 |
| report.css | 2767 | 2018-07-25 17:02:34 |
| Show.js | 1410 | 2018-07-25 17:02:34 |