Annual report pursuant to Section 13 and 15(d)

Schedule III - Real Estate and Accumulated Depreciation (Details 2)

v2.4.1.9
Schedule III - Real Estate and Accumulated Depreciation (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Changes in cost of properties      
Beginning balance $ 3,811,950us-gaap_RealEstateGrossAtCarryingValue $ 3,859,960us-gaap_RealEstateGrossAtCarryingValue $ 4,038,932us-gaap_RealEstateGrossAtCarryingValue
Acquisitions of operating properties 0us-gaap_RealEstateOtherAcquisitions 0us-gaap_RealEstateOtherAcquisitions 33,684us-gaap_RealEstateOtherAcquisitions
Building and land improvements 254,868us-gaap_RealEstateImprovements 249,639us-gaap_RealEstateImprovements 214,418us-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 0us-gaap_RealEstateOtherDeductions 0us-gaap_RealEstateOtherDeductions (135)us-gaap_RealEstateOtherDeductions
Ending balance 4,014,336us-gaap_RealEstateGrossAtCarryingValue [1],[2] 3,811,950us-gaap_RealEstateGrossAtCarryingValue 3,859,960us-gaap_RealEstateGrossAtCarryingValue
Changes in accumulated depreciation      
Beginning balance 597,649us-gaap_RealEstateAccumulatedDepreciation 568,176us-gaap_RealEstateAccumulatedDepreciation 577,601us-gaap_RealEstateAccumulatedDepreciation
Depreciation expense 111,326us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense 92,677us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense 93,158us-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 0us-gaap_RealEstateAccumulatedDepreciationOtherDeductions 0us-gaap_RealEstateAccumulatedDepreciationOtherDeductions (135)us-gaap_RealEstateAccumulatedDepreciationOtherDeductions
Ending balance $ 703,083us-gaap_RealEstateAccumulatedDepreciation [3] $ 597,649us-gaap_RealEstateAccumulatedDepreciation $ 568,176us-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.