v2.4.0.6

Real Estate and Accumulated Depreciation (Details 3) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Real estate assets: |  |  |
Balance at beginning of year | $ 11,080,161 | $ 12,010,668 | $ 12,498,513
Acquisitions of operating properties, transfers of development completions from CIP and improvements to operating properties and net affect of changes in foreign exchange rates and other | 12,150,482 | 631,860 | 1,840,879
Basis of operating properties disposed of | (906,602) | (1,140,511) | (1,145,256)
Change in the development portfolio balance, including the acquisition of properties | 0 | 174,235 | (990,217)
Impairment of real estate properties | (21,237) | (400) | (193,251)
Assets transferred to held-for-sale | (384,894) | (325,691) | 0
Balance at end of year | 22,413,079 | 11,080,161 | 12,010,668
Accumulated Depreciation: |  |  |
Depreciation expense | 574,524 | 298,164 | 275,689
Balances retired upon disposition of operating properties | (994) | (337,845) | (194,128)
Assets transferred to held-for-sale | (12,068) | (34,301) | 0
Balance at beginning of year | 1,589,251 | 1,663,233 | 1,581,672
Balance at end of year | $ 2,150,713 | $ 1,589,251 | $ 1,663,233

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- Definition The amount as of the balance sheet date of accumulated depreciation pertaining to real estate properties. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 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 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=6882300&loc=d3e5864-122674 + Details
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- Definition Amount of real estate investments acquired through foreclosure during the period. Title through foreclosure occurs in a legal proceeding in which a secured creditor obtains title typically by bidding the amount of debt owed to it after the borrower has defaulted on the debt instrument. + 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 210.12-28.4) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 Reference 2: 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 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 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=6882300&loc=d3e5864-122674 + Details
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