Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860546-13-000017-index-headers.html | 2013-04-30 13:50:46 | |
| 0000860546-13-000017-index.html | 2013-04-30 13:50:46 | |
| 0000860546-13-000017.txt | 2013-04-30 13:50:46 | |
 0000860546-13-000017-xbrl.zip | 327104 | 2013-04-30 13:50:46 |
| copt03312013ex311.htm | 13282 | 2013-04-30 13:50:46 |
| copt03312013ex312.htm | 13262 | 2013-04-30 13:50:46 |
| copt03312013ex321.htm | 5817 | 2013-04-30 13:50:46 |
| copt03312013ex322.htm | 5777 | 2013-04-30 13:50:46 |
| copt331201310qdocument.htm | 1868331 | 2013-04-30 13:50:46 |
| FilingSummary.xml | 32603 | 2013-04-30 13:50:46 |
| Financial_Report.xls | 2339748 | 2013-04-30 13:50:46 |
| ofc-20130331.xml | 2762836 | 2013-04-30 13:50:46 |
| ofc-20130331.xsd | 91365 | 2013-04-30 13:50:46 |
| ofc-20130331_cal.xml | 121708 | 2013-04-30 13:50:46 |
| ofc-20130331_def.xml | 422256 | 2013-04-30 13:50:46 |
| ofc-20130331_lab.xml | 1071449 | 2013-04-30 13:50:46 |
| ofc-20130331_pre.xml | 551450 | 2013-04-30 13:50:46 |
| R1.htm | 26714 | 2013-04-30 13:50:46 |
| R10.htm | 187211 | 2013-04-30 13:50:46 |
| R11.htm | 153614 | 2013-04-30 13:50:46 |
| R12.htm | 35382 | 2013-04-30 13:50:46 |
| R13.htm | 88177 | 2013-04-30 13:50:46 |
| R14.htm | 30774 | 2013-04-30 13:50:46 |
| R15.htm | 97316 | 2013-04-30 13:50:46 |
| R16.htm | 85740 | 2013-04-30 13:50:46 |
| R17.htm | 18870 | 2013-04-30 13:50:46 |
| R18.htm | 16799 | 2013-04-30 13:50:46 |
| R19.htm | 240570 | 2013-04-30 13:50:46 |
| R2.htm | 136051 | 2013-04-30 13:50:46 |
| R20.htm | 23803 | 2013-04-30 13:50:46 |
| R21.htm | 19573 | 2013-04-30 13:50:46 |
| R22.htm | 45477 | 2013-04-30 13:50:46 |
| R23.htm | 59739 | 2013-04-30 13:50:46 |
| R24.htm | 20174 | 2013-04-30 13:50:46 |
| R25.htm | 6897 | 2013-04-30 13:50:46 |
| R26.htm | 25631 | 2013-04-30 13:50:46 |
| R27.htm | 10745 | 2013-04-30 13:50:46 |
| R28.htm | 176092 | 2013-04-30 13:50:46 |
| R29.htm | 146697 | 2013-04-30 13:50:46 |
| R3.htm | 34839 | 2013-04-30 13:50:46 |
| R30.htm | 25115 | 2013-04-30 13:50:46 |
| R31.htm | 94329 | 2013-04-30 13:50:46 |
| R32.htm | 29421 | 2013-04-30 13:50:46 |
| R33.htm | 107978 | 2013-04-30 13:50:46 |
| R34.htm | 87144 | 2013-04-30 13:50:46 |
| R35.htm | 19877 | 2013-04-30 13:50:46 |
| R36.htm | 248890 | 2013-04-30 13:50:46 |
| R37.htm | 10344 | 2013-04-30 13:50:46 |
| R38.htm | 15493 | 2013-04-30 13:50:46 |
| R39.htm | 41211 | 2013-04-30 13:50:46 |
| R4.htm | 167486 | 2013-04-30 13:50:46 |
| R40.htm | 54964 | 2013-04-30 13:50:46 |
| R41.htm | 19606 | 2013-04-30 13:50:46 |
| R42.htm | 15955 | 2013-04-30 13:50:46 |
| R43.htm | 15042 | 2013-04-30 13:50:46 |
| R44.htm | 162121 | 2013-04-30 13:50:46 |
| R45.htm | 49660 | 2013-04-30 13:50:46 |
| R46.htm | 17924 | 2013-04-30 13:50:46 |
| R47.htm | 37732 | 2013-04-30 13:50:46 |
| R48.htm | 13751 | 2013-04-30 13:50:46 |
| R49.htm | 7552 | 2013-04-30 13:50:46 |
| R5.htm | 39116 | 2013-04-30 13:50:46 |
| R50.htm | 16468 | 2013-04-30 13:50:46 |
| R51.htm | 104107 | 2013-04-30 13:50:46 |
| R52.htm | 26473 | 2013-04-30 13:50:46 |
| R53.htm | 20900 | 2013-04-30 13:50:46 |
| R54.htm | 109611 | 2013-04-30 13:50:46 |
| R55.htm | 22748 | 2013-04-30 13:50:46 |
| R56.htm | 75619 | 2013-04-30 13:50:46 |
| R57.htm | 13657 | 2013-04-30 13:50:46 |
| R58.htm | 20865 | 2013-04-30 13:50:46 |
| R59.htm | 63125 | 2013-04-30 13:50:46 |
| R6.htm | 64782 | 2013-04-30 13:50:46 |
| R60.htm | 77592 | 2013-04-30 13:50:46 |
| R61.htm | 10368 | 2013-04-30 13:50:46 |
| R62.htm | 74083 | 2013-04-30 13:50:46 |
| R63.htm | 20044 | 2013-04-30 13:50:46 |
| R64.htm | 65364 | 2013-04-30 13:50:46 |
| R65.htm | 89119 | 2013-04-30 13:50:46 |
| R66.htm | 13772 | 2013-04-30 13:50:46 |
| R67.htm | 43509 | 2013-04-30 13:50:46 |
| R68.htm | 15836 | 2013-04-30 13:50:46 |
| R7.htm | 27338 | 2013-04-30 13:50:46 |
| R8.htm | 209503 | 2013-04-30 13:50:46 |
| R9.htm | 19180 | 2013-04-30 13:50:46 |
| report.css | 2721 | 2013-04-30 13:50:46 |
| Show.js | 6423 | 2013-04-30 13:50:46 |