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Properties, net (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | --- | ---
Properties |  |  |  |  |
Gross | $ 3,811,950 | [1],[2] | $ 3,859,960 | $ 4,038,932 | $ 3,948,487
Operating properties, net | 2,702,693 |  | 2,597,666 | 2,597,666 |
Operating properties, net |  |  |  |  |
Properties |  |  |  |  |
Less: accumulated depreciation | (597,649) |  | (555,975) |  |
Operating properties, net | Land |  |  |  |  |
Properties |  |  |  |  |
Gross | 430,472 |  | 427,766 |  |
Operating properties, net | Buildings and improvements |  |  |  |  |
Properties |  |  |  |  |
Gross | $ 2,869,870 |  | $ 2,725,875 |  |
[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.

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