Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860546-17-000045-index-headers.html | 2017-10-27 17:20:50 | |
| 0000860546-17-000045-index.html | 2017-10-27 17:20:50 | |
| 0000860546-17-000045.txt | 2017-10-27 17:20:50 | |
 0000860546-17-000045-xbrl.zip | 346491 | 2017-10-27 17:20:50 |
| copt09302017ex121.htm | 27657 | 2017-10-27 17:20:50 |
| copt09302017ex122.htm | 23028 | 2017-10-27 17:20:50 |
| copt09302017ex311.htm | 13284 | 2017-10-27 17:20:50 |
| copt09302017ex312.htm | 13262 | 2017-10-27 17:20:50 |
| copt09302017ex313.htm | 14559 | 2017-10-27 17:20:50 |
| copt09302017ex314.htm | 13604 | 2017-10-27 17:20:50 |
| copt09302017ex321.htm | 5810 | 2017-10-27 17:20:50 |
| copt09302017ex322.htm | 5767 | 2017-10-27 17:20:50 |
| copt09302017ex323.htm | 6045 | 2017-10-27 17:20:50 |
| copt09302017ex324.htm | 6138 | 2017-10-27 17:20:50 |
| copt10q09302017document.htm | 2625123 | 2017-10-27 17:20:50 |
| FilingSummary.xml | 38286 | 2017-10-27 17:20:50 |
| Financial_Report.xlsx | 102650 | 2017-10-27 17:20:50 |
| ofc-20170930.xml | 2998139 | 2017-10-27 17:20:50 |
| ofc-20170930.xsd | 80174 | 2017-10-27 17:20:50 |
| ofc-20170930_cal.xml | 119219 | 2017-10-27 17:20:50 |
| ofc-20170930_def.xml | 483651 | 2017-10-27 17:20:50 |
| ofc-20170930_lab.xml | 1023680 | 2017-10-27 17:20:50 |
| ofc-20170930_pre.xml | 577099 | 2017-10-27 17:20:50 |
| R1.htm | 25027 | 2017-10-27 17:20:50 |
| R10.htm | 29230 | 2017-10-27 17:20:50 |
| R11.htm | 78600 | 2017-10-27 17:20:50 |
| R12.htm | 72244 | 2017-10-27 17:20:50 |
| R13.htm | 41935 | 2017-10-27 17:20:50 |
| R14.htm | 14862 | 2017-10-27 17:20:50 |
| R15.htm | 21761 | 2017-10-27 17:20:50 |
| R16.htm | 92411 | 2017-10-27 17:20:50 |
| R17.htm | 83208 | 2017-10-27 17:20:50 |
| R18.htm | 21932 | 2017-10-27 17:20:50 |
| R19.htm | 16309 | 2017-10-27 17:20:50 |
| R2.htm | 118521 | 2017-10-27 17:20:50 |
| R20.htm | 424514 | 2017-10-27 17:20:50 |
| R21.htm | 27122 | 2017-10-27 17:20:50 |
| R22.htm | 144528 | 2017-10-27 17:20:50 |
| R23.htm | 36352 | 2017-10-27 17:20:50 |
| R24.htm | 32374 | 2017-10-27 17:20:50 |
| R25.htm | 67064 | 2017-10-27 17:20:50 |
| R26.htm | 65989 | 2017-10-27 17:20:50 |
| R27.htm | 39568 | 2017-10-27 17:20:50 |
| R28.htm | 12306 | 2017-10-27 17:20:50 |
| R29.htm | 21623 | 2017-10-27 17:20:50 |
| R3.htm | 37010 | 2017-10-27 17:20:50 |
| R30.htm | 90325 | 2017-10-27 17:20:50 |
| R31.htm | 82719 | 2017-10-27 17:20:50 |
| R32.htm | 19699 | 2017-10-27 17:20:50 |
| R33.htm | 427197 | 2017-10-27 17:20:50 |
| R34.htm | 9488 | 2017-10-27 17:20:50 |
| R35.htm | 133680 | 2017-10-27 17:20:50 |
| R36.htm | 27178 | 2017-10-27 17:20:50 |
| R37.htm | 27231 | 2017-10-27 17:20:50 |
| R38.htm | 8887 | 2017-10-27 17:20:50 |
| R39.htm | 11823 | 2017-10-27 17:20:50 |
| R4.htm | 98691 | 2017-10-27 17:20:50 |
| R40.htm | 15765 | 2017-10-27 17:20:50 |
| R41.htm | 31063 | 2017-10-27 17:20:50 |
| R42.htm | 14659 | 2017-10-27 17:20:50 |
| R43.htm | 11319 | 2017-10-27 17:20:50 |
| R44.htm | 30314 | 2017-10-27 17:20:50 |
| R45.htm | 40851 | 2017-10-27 17:20:50 |
| R46.htm | 20052 | 2017-10-27 17:20:50 |
| R47.htm | 44124 | 2017-10-27 17:20:50 |
| R48.htm | 12868 | 2017-10-27 17:20:50 |
| R49.htm | 29506 | 2017-10-27 17:20:50 |
| R5.htm | 33572 | 2017-10-27 17:20:50 |
| R50.htm | 97171 | 2017-10-27 17:20:50 |
| R51.htm | 17836 | 2017-10-27 17:20:50 |
| R52.htm | 69369 | 2017-10-27 17:20:50 |
| R53.htm | 18529 | 2017-10-27 17:20:50 |
| R54.htm | 34523 | 2017-10-27 17:20:50 |
| R55.htm | 82819 | 2017-10-27 17:20:50 |
| R56.htm | 25865 | 2017-10-27 17:20:50 |
| R57.htm | 32924 | 2017-10-27 17:20:50 |
| R58.htm | 11610 | 2017-10-27 17:20:50 |
| R59.htm | 83563 | 2017-10-27 17:20:50 |
| R6.htm | 97278 | 2017-10-27 17:20:50 |
| R60.htm | 41719 | 2017-10-27 17:20:50 |
| R61.htm | 27516 | 2017-10-27 17:20:50 |
| R62.htm | 36919 | 2017-10-27 17:20:50 |
| R63.htm | 18861 | 2017-10-27 17:20:50 |
| R64.htm | 16327 | 2017-10-27 17:20:50 |
| R7.htm | 20139 | 2017-10-27 17:20:50 |
| R8.htm | 176079 | 2017-10-27 17:20:50 |
| R9.htm | 14821 | 2017-10-27 17:20:50 |
| report.css | 2767 | 2017-10-27 17:20:50 |
| Show.js | 1410 | 2017-10-27 17:20:50 |