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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, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Changes in cost of properties |  |  |  |
Beginning balance | $ 3,859,960 |  | $ 4,038,932 | $ 3,948,487
Acquisitions of operating properties | 0 |  | 33,684 | 26,887
Building and land improvements | 249,639 |  | 214,418 | 304,079
Sales | (141,045) |  | (291,491) | (75,315)
Impairments | (45,931) |  | (121,557) | (165,206)
Other dispositions | (110,673) |  | (13,891) | 0
Other | 0 |  | (135) | 0
Ending balance | 3,811,950 | [1],[2] | 3,859,960 | 4,038,932
Changes in accumulated depreciation |  |  |  |
Beginning balance | 568,176 |  | 577,601 | 503,032
Depreciation expense | 92,677 |  | 93,158 | 99,173
Sales | (9,542) |  | (40,346) | (9,640)
Impairments | (14,863) |  | (58,855) | (15,039)
Other dispositions | (38,799) |  | (3,247) | 0
Other | 0 |  | (135) | 75
Ending balance | $ 597,649 | [3] | $ 568,176 | $ 577,601
[1] | The aggregate cost of these assets for Federal income tax purposes was approximately $3.3 billion at December 31, 2013.
[2] | As discussed in Note 3 to our Consolidated Financial Statements, we recognized impairment losses of $5.9 million in connection with two properties in the Greater Baltimore region that we determined no longer met our strategic investment criteria.
[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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