Annual report pursuant to Section 13 and 15(d)

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

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Schedule III - Real Estate and Accumulated Depreciation (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
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.