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Schedule III - Real Estate and Accumulated Depreciation and Amortization Summary (Details) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Real Estate and Accumulated Depreciation [Line Items] |  |  |
Total cost basis for federal income tax purposes | $ 4,600,000,000 |  |
Reconciliation of real estate owned: |  |  |
Balance at the beginning of year | 3,564,466,000 | 3,172,246,000 | 3,363,586,000
Additions during year | 492,437,000 | 540,847,000 | 143,382,000
Properties sold during year | (212,771,000) | (138,041,000) | (230,397,000)
Properties impaired during the year | (31,741,000) | (10,553,000) | (103,727,000)
Other reclassifications | (97,000) | (33,000) | (598,000)
Balance at end of year | 3,812,294,000 | 3,564,466,000 | 3,172,246,000
Reconciliation of accumulated depreciation and amortization: |  |  |
Balance at the beginning of year | 738,068,000 | 638,368,000 | 601,239,000
Depreciation and amortization expense | 122,057,000 | 119,067,000 | 114,247,000
Accumulated depreciation and amortization of properties sold, impaired and held for sale during year | (84,508,000) | (19,367,000) | (76,939,000)
Other reclassifications | 0 | 0 | (179,000)
Balance at end of year | $ 775,617,000 | $ 738,068,000 | $ 638,368,000

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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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- Definition Amount of other deductions to accumulated depreciation, excluding sales, 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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