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Schedule III - Real Estate and Accumulated Depreciation (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Changes in cost of properties |  |  |  |
Beginning balance | $ 3,811,950 us-gaap_RealEstateGrossAtCarryingValue |  | $ 3,859,960 us-gaap_RealEstateGrossAtCarryingValue | $ 4,038,932 us-gaap_RealEstateGrossAtCarryingValue
Acquisitions of operating properties | 0 us-gaap_RealEstateOtherAcquisitions |  | 0 us-gaap_RealEstateOtherAcquisitions | 33,684 us-gaap_RealEstateOtherAcquisitions
Building and land improvements | 254,868 us-gaap_RealEstateImprovements |  | 249,639 us-gaap_RealEstateImprovements | 214,418 us-gaap_RealEstateImprovements
Sales | (48,466)us-gaap_RealEstateCostOfRealEstateSold |  | (141,045)us-gaap_RealEstateCostOfRealEstateSold | (291,491)us-gaap_RealEstateCostOfRealEstateSold
Impairments | (3,042)ofc_RealEstateImpairments |  | (45,931)ofc_RealEstateImpairments | (121,557)ofc_RealEstateImpairments
Other dispositions | (974)ofc_RealEstateOtherDispositions |  | (110,673)ofc_RealEstateOtherDispositions | (13,891)ofc_RealEstateOtherDispositions
Other | 0 us-gaap_RealEstateOtherDeductions |  | 0 us-gaap_RealEstateOtherDeductions | (135)us-gaap_RealEstateOtherDeductions
Ending balance | 4,014,336 us-gaap_RealEstateGrossAtCarryingValue | [1],[2] | 3,811,950 us-gaap_RealEstateGrossAtCarryingValue | 3,859,960 us-gaap_RealEstateGrossAtCarryingValue
Changes in accumulated depreciation |  |  |  |
Beginning balance | 597,649 us-gaap_RealEstateAccumulatedDepreciation |  | 568,176 us-gaap_RealEstateAccumulatedDepreciation | 577,601 us-gaap_RealEstateAccumulatedDepreciation
Depreciation expense | 111,326 us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense |  | 92,677 us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense | 93,158 us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense
Sales | (3,129)us-gaap_RealEstateAccumulatedDepreciationRealEstateSold |  | (9,542)us-gaap_RealEstateAccumulatedDepreciationRealEstateSold | (40,346)us-gaap_RealEstateAccumulatedDepreciationRealEstateSold
Impairments | (1,671)ofc_RealEstateAccumulatedDepreciationImpairments |  | (14,863)ofc_RealEstateAccumulatedDepreciationImpairments | (58,855)ofc_RealEstateAccumulatedDepreciationImpairments
Other dispositions | (1,092)ofc_RealEstateAccumulatedDepreciationOtherDispositions |  | (38,799)ofc_RealEstateAccumulatedDepreciationOtherDispositions | (3,247)ofc_RealEstateAccumulatedDepreciationOtherDispositions
Other | 0 us-gaap_RealEstateAccumulatedDepreciationOtherDeductions |  | 0 us-gaap_RealEstateAccumulatedDepreciationOtherDeductions | (135)us-gaap_RealEstateAccumulatedDepreciationOtherDeductions
Ending balance | $ 703,083 us-gaap_RealEstateAccumulatedDepreciation | [3] | $ 597,649 us-gaap_RealEstateAccumulatedDepreciation | $ 568,176 us-gaap_RealEstateAccumulatedDepreciation
[1] | As discussed in Note 3 to our Consolidated Financial Statements, we recognized impairment losses of $1.4 million primarily in connection with certain of our operating properties in the Greater Baltimore region that were disposed in the current period.
[2] | The aggregate cost of these assets for Federal income tax purposes was approximately $3.4 billion at December 31, 2014.
[3] | The estimated lives over which depreciation is recognized follow: Building and land improvements: 10-40 years; and tenant improvements: related lease terms.

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- Definition Amount of accumulated depreciation pertaining to real estate investments for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28.FN4) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 + Details
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