Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860546-22-000051-index-headers.html | 2022-11-01 12:33:20 | |
| 0000860546-22-000051-index.html | 2022-11-01 12:33:20 | |
| 0000860546-22-000051.txt | 2022-11-01 12:33:20 | |
 0000860546-22-000051-xbrl.zip | 638109 | 2022-11-01 12:33:20 |
| copt09302022ex101.htm | 1632919 | 2022-11-01 12:33:20 |
| copt09302022ex311.htm | 11709 | 2022-11-01 12:33:20 |
| copt09302022ex312.htm | 11687 | 2022-11-01 12:33:20 |
| copt09302022ex321.htm | 5353 | 2022-11-01 12:33:20 |
| copt09302022ex322.htm | 5310 | 2022-11-01 12:33:20 |
| FilingSummary.xml | 53503 | 2022-11-01 12:33:20 |
| Financial_Report.xlsx | 143210 | 2022-11-01 12:33:20 |
| MetaLinks.json | 965411 | 2022-11-01 12:33:20 |
| ofc-20220930.htm | 2931200 | 2022-11-01 12:33:20 |
| ofc-20220930.xsd | 90415 | 2022-11-01 12:33:20 |
| ofc-20220930_cal.xml | 136554 | 2022-11-01 12:33:20 |
| ofc-20220930_def.xml | 439808 | 2022-11-01 12:33:20 |
 ofc-20220930_g1.jpg | 41746 | 2022-11-01 12:33:20 |
| ofc-20220930_htm.xml | 3264872 | 2022-11-01 12:33:20 |
| ofc-20220930_lab.xml | 1003342 | 2022-11-01 12:33:20 |
| ofc-20220930_pre.xml | 667101 | 2022-11-01 12:33:20 |
| R1.htm | 53134 | 2022-11-01 12:33:20 |
| R10.htm | 10005 | 2022-11-01 12:33:20 |
| R11.htm | 32647 | 2022-11-01 12:33:20 |
| R12.htm | 37504 | 2022-11-01 12:33:20 |
| R13.htm | 309591 | 2022-11-01 12:33:20 |
| R14.htm | 38465 | 2022-11-01 12:33:20 |
| R15.htm | 13335 | 2022-11-01 12:33:20 |
| R16.htm | 21609 | 2022-11-01 12:33:20 |
| R17.htm | 65026 | 2022-11-01 12:33:20 |
| R18.htm | 49335 | 2022-11-01 12:33:20 |
| R19.htm | 14481 | 2022-11-01 12:33:20 |
| R2.htm | 120859 | 2022-11-01 12:33:20 |
| R20.htm | 10562 | 2022-11-01 12:33:20 |
| R21.htm | 74129 | 2022-11-01 12:33:20 |
| R22.htm | 290564 | 2022-11-01 12:33:20 |
| R23.htm | 53613 | 2022-11-01 12:33:20 |
| R24.htm | 18136 | 2022-11-01 12:33:20 |
| R25.htm | 71221 | 2022-11-01 12:33:20 |
| R26.htm | 9670 | 2022-11-01 12:33:20 |
| R27.htm | 9120 | 2022-11-01 12:33:20 |
| R28.htm | 13153 | 2022-11-01 12:33:20 |
| R29.htm | 26726 | 2022-11-01 12:33:20 |
| R3.htm | 17534 | 2022-11-01 12:33:20 |
| R30.htm | 41217 | 2022-11-01 12:33:20 |
| R31.htm | 99985 | 2022-11-01 12:33:20 |
| R32.htm | 40157 | 2022-11-01 12:33:20 |
| R33.htm | 12102 | 2022-11-01 12:33:20 |
| R34.htm | 21455 | 2022-11-01 12:33:20 |
| R35.htm | 63599 | 2022-11-01 12:33:20 |
| R36.htm | 54480 | 2022-11-01 12:33:20 |
| R37.htm | 12915 | 2022-11-01 12:33:20 |
| R38.htm | 72991 | 2022-11-01 12:33:20 |
| R39.htm | 295393 | 2022-11-01 12:33:20 |
| R4.htm | 129745 | 2022-11-01 12:33:20 |
| R40.htm | 49761 | 2022-11-01 12:33:20 |
| R41.htm | 8496 | 2022-11-01 12:33:20 |
| R42.htm | 69223 | 2022-11-01 12:33:20 |
| R43.htm | 41090 | 2022-11-01 12:33:20 |
| R44.htm | 11592 | 2022-11-01 12:33:20 |
| R45.htm | 33401 | 2022-11-01 12:33:20 |
| R46.htm | 14310 | 2022-11-01 12:33:20 |
| R47.htm | 22586 | 2022-11-01 12:33:20 |
| R48.htm | 17915 | 2022-11-01 12:33:20 |
| R49.htm | 27077 | 2022-11-01 12:33:20 |
| R5.htm | 38313 | 2022-11-01 12:33:20 |
| R50.htm | 15324 | 2022-11-01 12:33:20 |
| R51.htm | 36391 | 2022-11-01 12:33:20 |
| R52.htm | 3883 | 2022-11-01 12:33:20 |
| R53.htm | 11694 | 2022-11-01 12:33:20 |
| R54.htm | 6733 | 2022-11-01 12:33:20 |
| R55.htm | 14288 | 2022-11-01 12:33:20 |
| R56.htm | 6858 | 2022-11-01 12:33:20 |
| R57.htm | 20354 | 2022-11-01 12:33:20 |
| R58.htm | 47058 | 2022-11-01 12:33:20 |
| R59.htm | 12148 | 2022-11-01 12:33:20 |
| R6.htm | 59049 | 2022-11-01 12:33:20 |
| R60.htm | 20912 | 2022-11-01 12:33:20 |
| R61.htm | 19579 | 2022-11-01 12:33:20 |
| R62.htm | 22080 | 2022-11-01 12:33:20 |
| R63.htm | 37792 | 2022-11-01 12:33:20 |
| R64.htm | 74726 | 2022-11-01 12:33:20 |
| R65.htm | 21611 | 2022-11-01 12:33:20 |
| R66.htm | 4583 | 2022-11-01 12:33:20 |
| R67.htm | 17673 | 2022-11-01 12:33:20 |
| R68.htm | 29601 | 2022-11-01 12:33:20 |
| R69.htm | 11820 | 2022-11-01 12:33:20 |
| R7.htm | 11840 | 2022-11-01 12:33:20 |
| R70.htm | 12807 | 2022-11-01 12:33:20 |
| R71.htm | 12952 | 2022-11-01 12:33:20 |
| R72.htm | 16724 | 2022-11-01 12:33:20 |
| R73.htm | 6735 | 2022-11-01 12:33:20 |
| R74.htm | 36459 | 2022-11-01 12:33:20 |
| R75.htm | 44662 | 2022-11-01 12:33:20 |
| R76.htm | 3918 | 2022-11-01 12:33:20 |
| R77.htm | 100837 | 2022-11-01 12:33:20 |
| R78.htm | 55851 | 2022-11-01 12:33:20 |
| R79.htm | 59017 | 2022-11-01 12:33:20 |
| R8.htm | 140543 | 2022-11-01 12:33:20 |
| R80.htm | 20747 | 2022-11-01 12:33:20 |
| R81.htm | 24452 | 2022-11-01 12:33:20 |
| R82.htm | 20712 | 2022-11-01 12:33:20 |
| R83.htm | 10054 | 2022-11-01 12:33:20 |
| R84.htm | 9659 | 2022-11-01 12:33:20 |
| R85.htm | 69051 | 2022-11-01 12:33:20 |
| R86.htm | 87332 | 2022-11-01 12:33:20 |
| R87.htm | 17608 | 2022-11-01 12:33:20 |
| R88.htm | 14676 | 2022-11-01 12:33:20 |
| R89.htm | 38478 | 2022-11-01 12:33:20 |
| R9.htm | 9876 | 2022-11-01 12:33:20 |
| report.css | 2768 | 2022-11-01 12:33:20 |
| Show.js | 1086 | 2022-11-01 12:33:20 |