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REAL ESTATE AND ACCUMULATED DEPRECIATION (Details 2) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Estimated useful lives |  |  |
Aggregate cost of total real estate for federal income tax purposes | $ 20,223 |  |
Changes in total real estate assets |  |  |
Balance, beginning of period | 19,268,099 | $ 17,849,316 | $ 16,800,321
Acquisitions, construction costs and improvements | 1,788,515 | 1,667,989 | 1,311,003
Dispositions, including impairment loss on planned dispositions | (279,988) | (249,206) | (262,008)
Balance, end of period | 20,776,626 | 19,268,099 | 17,849,316
Changes in accumulated depreciation |  |  |
Balance, beginning of period | 3,325,790 | 2,913,576 | 2,516,112
Depreciation, including discontinued operations | 531,434 | 477,923 | 442,682
Dispositions | (113,592) | (65,709) | (45,218)
Balance, end of period | $ 3,743,632 | $ 3,325,790 | $ 2,913,576
Building |  |  |
Estimated useful lives |  |  |
Estimated useful lives of assets (in years) | 30 years |  |
Improvements, upgrades and FF&E |  |  |
Estimated useful lives |  |  |
Estimated useful lives of assets (in years) | 7 years |  |

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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 + Details
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- Definition Amount of decrease to accumulated depreciation for real estate investments sold 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 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 2: 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 + Details
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