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Discontinued Operations (Details) (USD $) | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 0 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2013 Discontinued operations | Jun. 30, 2013 Discontinued operations | Oct. 29, 2013 Discontinued operations Commercial property in Richardson, Texas
Discontinued operations |  |  |  |  |  |  |
Gain (Loss) on sale of properties |  |  |  |  |  |  | $ 2,200,000
Operating results for the asset held for sale |  |  |  |  |  |  |
Rental revenue | 60,994,000 | 46,017,000 | 122,591,000 | 88,859,000 | 306,000 | 611,000 |
Real estate taxes and insurance | (9,763,000) | (7,308,000) | (19,014,000) | (13,903,000) | (3,000) | (5,000) |
Depreciation and amortization | (23,563,000) | (16,921,000) | (47,863,000) | (32,702,000) | (205,000) | (410,000) |
Income from discontinued operations |  | $ 98,000 |  | $ 196,000 | $ 98,000 | $ 196,000 |

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- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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