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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, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Real Estate and Accumulated Depreciation [Line Items] |  |  |
Total cost basis for federal income tax purposes | $ 4,200,000,000 |  |
Reconciliation of real estate owned: |  |  |
Balance at the beginning of year | 3,172,246,000 | 3,363,586,000 | 3,552,806,000
Additions during year | 540,847,000 | 143,382,000 | 46,994,000
Properties sold during year | (138,041,000) | (230,397,000) | (221,875,000)
Reclassified held for sale properties | 0 | 0 | (9,381,000)
Properties impaired during the year | (10,553,000) | (103,727,000) | (3,327,000)
Translation adjustment on foreign currency | 0 | 0 | (1,432,000)
Other reclassifications | (33,000) | (598,000) | (199,000)
Balance at end of year | 3,564,466,000 | 3,172,246,000 | 3,363,586,000
Reconciliation of accumulated depreciation and amortization: |  |  |
Balance at the beginning of year | 638,368,000 | 601,239,000 | 537,406,000
Depreciation and amortization expense | 119,067,000 | 114,247,000 | 115,553,000
Accumulated depreciation and amortization of properties sold, impaired and held for sale during year | (19,367,000) | (76,939,000) | (51,478,000)
Translation adjustment on foreign currency | 0 | 0 | (242,000)
Other reclassifications | 0 | (179,000) | 0
Balance at end of year | $ 738,068,000 | $ 638,368,000 | $ 601,239,000

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