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Investments in Partially Owned Entities (Details) (USD $) | 3 Months Ended | 9 Months Ended |  |  | 9 Months Ended | 7 Months Ended |  |  | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2014 San Norterra [Domain] | Sep. 30, 2014 Consolidated Development Projects Held for and or Under Development [Member] | Sep. 30, 2014 Consolidated Operating [Domain] | Sep. 30, 2014 Consolidated Total [Domain] | Sep. 30, 2014 Unconsolidated Development Projects Held for and or Under Development [Domain] | Sep. 30, 2014 Unconsolidated Completed, Not Stabilized [Domain] | Sep. 30, 2014 Unconsolidated Operating [Domain] | Sep. 30, 2014 Unconsolidated Total [Domain] | Sep. 30, 2014 Parc on Powell (formerly 1333 Powell) [Domain] | Sep. 30, 2014 Archstone Transaction [Member] | Mar. 31, 2013 Archstone Transaction [Member] | Sep. 30, 2014 Residual JV [Domain] | Sep. 30, 2014 Wisconsin Place [Domain] | Sep. 30, 2014 San Norterra [Domain] | Sep. 30, 2014 Waterton Tenside [Domain] | Sep. 30, 2014 Parc on Powell (formerly 1333 Powell) [Domain] | Sep. 30, 2014 Joint Venture Partner [Member] | Sep. 30, 2014 Company's Portion [Member] | Sep. 30, 2014 Nexus Sawgrass [Member] | Sep. 30, 2014 Domain [Member] | Sep. 30, 2014 London Interbank Offered Rate (LIBOR) [Member] San Norterra [Domain] | Sep. 30, 2014 London Interbank Offered Rate (LIBOR) [Member] Parc on Powell (formerly 1333 Powell) [Domain]
Investments In Partially Owned Entities (Textuals) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liquidation Value Preferred Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 73,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75.00% |  |  |  |  |  |  |  |  |
Joint Venture Partner Ownership Percentage | 80.00% |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |  |  |  |  |  |  |
Initial Basis of Real Estate, Consolidated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 198,500,000 |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 20.00% |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 85.00% | 20.00% | 5.00% |  |  |  |  |  |
Initial Basis of Real Estate, Unconsolidated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,900,000 | 5,100,000 | 2,100,000 |  |  |  |  |  |
Project Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 52,800,000 |  | 75,000,000 |  |  | 78,600,000 | 155,800,000 |  |
Maximum Debt Commitment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34,800,000 |  | 39,500,000 |  |  | 48,700,000 | 98,600,000 |  |
Debt Instrument, Description of Variable Rate Basis |  |  |  |  |  |  | LIBOR plus 2.00% |  |  |  |  |  |  |  | LIBOR plus 2.25% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.05% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% | 2.25%
Debt Instrument, Maturity Date |  |  | May 01, 2061 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jan. 06, 2015 | Dec. 01, 2018 | Aug. 14, 2015 |  |  | Jan. 01, 2021 | Jan. 01, 2022 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.66% |  |  |  | 5.60% | 5.75% |  |
Partially Owned Unconsolidated Units To Be Developed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 176 |  |  |  |  |  |
Guarantor Obligations, Maximum Exposure |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,700,000 |  |  |  |  |  |  | 19,700,000 |  |  |  |  |  |
Proceeds From Distributions Received From Unconsolidated Subsidiaries |  |  | 77,042,000 | 25,471,000 |  |  |  |  |  |  |  |  |  |  |  | 95,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Preferred Interests |  |  | 65,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 39,000,000 |  |  |  |
Land purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 57,900,000 | 76,100,000 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 404,400,000 |  | 404,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,700,000 | 102,500,000 |  |  |  |
Investment in Joint Venture | 331,800,000 |  | 331,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Joint Ventures | 2 |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partners Payments To Acquire Equity Method Investments |  |  | 40,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
land parcel disposed |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Net gain on sales of real estate properties | 113,641,000 | 0 | 128,544,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,052,000 |  |  |  |  |
Partially Owned Property Balance Sheet Schedule |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties | 396 |  | 396 |  |  |  |  | 0 | 19 | 19 | 0 | 1 | 3 | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Units in Real Estate Property | 111,087 |  | 111,087 |  |  |  |  | 0 | 3,771 | 3,771 | 0 | 444 | 1,225 | 1,669 |  |  |  |  | 432 | 388 | 336 |  |  |  |  |  |  |
ASSETS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investment Property, at Cost | 27,574,865,000 |  | 27,574,865,000 |  | 26,800,948,000 |  |  | 324,997,000 | 679,956,000 | 1,004,953,000 | 61,037,000 | 155,413,000 | 186,779,000 | 403,229,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investment Property, Accumulated Depreciation | (5,314,260,000) |  | (5,314,260,000) |  | (4,807,709,000) |  |  | 0 | (189,005,000) | (189,005,000) | 0 | (5,313,000) | (12,185,000) | (17,498,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in real estate, net | 22,260,605,000 |  | 22,260,605,000 |  | 21,993,239,000 |  |  | 324,997,000 | 490,951,000 | 815,948,000 | 61,037,000 | 150,100,000 | 174,594,000 | 385,731,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and Cash Equivalents, at Carrying Value | 31,478,000 | 972,761,000 | 31,478,000 | 972,761,000 | 53,534,000 | 612,590,000 |  | 2,953,000 | 15,820,000 | 18,773,000 | 66,000 | 1,975,000 | 4,486,000 | 6,527,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | 128,100,000 |  | 128,100,000 |  | 178,526,000 |  |  | 0 | 52,641,000 | 52,641,000 | 0 | 0 | 0 | 0 |  |  |  | 147,600,000 | 56,500,000 |  |  |  |  |  |  |  |  |
Restricted Cash and Cash Equivalents | 84,945,000 |  | 84,945,000 |  | 103,567,000 |  |  | 31,236,000 | 300,000 | 31,536,000 | 0 | 0 | 189,000 | 189,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Finance Costs, Net | 60,530,000 |  | 60,530,000 |  | 58,486,000 |  |  | 0 | 2,229,000 | 2,229,000 | 41,000 | 0 | 158,000 | 199,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Assets | 396,441,000 |  | 396,441,000 |  | 404,557,000 |  |  | 6,679,000 | 26,927,000 | 33,606,000 | 0 | 50,000 | 1,039,000 | 1,089,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets | 23,008,094,000 |  | 23,008,094,000 |  | 22,834,545,000 |  |  | 365,865,000 | 588,868,000 | 954,733,000 | 61,144,000 | 152,125,000 | 180,466,000 | 393,735,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Debt | 5,090,960,000 |  | 5,090,960,000 |  | 5,174,166,000 |  |  | 0 | 360,392,000 | 360,392,000 | 25,631,000 | 96,793,000 | 111,800,000 | 234,224,000 |  |  |  |  |  | 33,000,000 | 30,100,000 | 25,600,000 |  |  | 48,600,000 | 96,800,000 |  |
Accounts Payable And Accrued Liabilities Current And Noncurrent Other Than Interest And Dividend Payable | 203,070,000 |  | 203,070,000 |  | 118,791,000 |  |  | 16,707,000 | 3,217,000 | 19,924,000 | 5,730,000 | 456,000 | 1,467,000 | 7,653,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Payable | 86,472,000 |  | 86,472,000 |  | 78,309,000 |  |  | 0 | 1,266,000 | 1,266,000 | 51,000 | 464,000 | 269,000 | 784,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Liabilities | 349,371,000 |  | 349,371,000 |  | 347,748,000 |  |  | 0 | 1,230,000 | 1,230,000 | 3,000 | 88,000 | 986,000 | 1,077,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Security Deposit Liability | 75,738,000 |  | 75,738,000 |  | 71,592,000 |  |  | 0 | 1,975,000 | 1,975,000 | 0 | 161,000 | 296,000 | 457,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total liabilities | 11,860,523,000 |  | 11,860,523,000 |  | 11,626,205,000 |  |  | 16,707,000 | 368,080,000 | 384,787,000 | 31,415,000 | 97,962,000 | 114,818,000 | 244,195,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interests Partially Owned Properties | 125,197,000 |  | 125,197,000 |  | 126,583,000 |  |  | 117,351,000 | 7,846,000 | 125,197,000 | 27,858,000 | 47,223,000 | 46,639,000 | 121,720,000 |  |  |  |  |  |  |  |  | 117,400,000 |  |  |  |  |
Parent Equity Interest |  |  |  |  |  |  |  | 231,807,000 | 212,942,000 | 444,749,000 | 1,871,000 | 6,940,000 | 19,009,000 | 27,820,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Equity Interest |  |  |  |  |  |  |  | 349,158,000 | 220,788,000 | 569,946,000 | 29,729,000 | 54,163,000 | 65,648,000 | 149,540,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total liabilities and equity | 23,008,094,000 |  | 23,008,094,000 |  | 22,834,545,000 |  |  | 365,865,000 | 588,868,000 | 954,733,000 | 61,144,000 | 152,125,000 | 180,466,000 | 393,735,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partially Owned Property Income Statement Schedule |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue | 664,078,000 | 626,629,000 | 1,950,088,000 | 1,748,568,000 |  |  |  | 0 | 65,565,000 | 65,565,000 | 0 | 6,874,000 | 14,499,000 | 21,373,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Expenses |  |  |  |  |  |  |  | 0 | 19,390,000 | 19,390,000 | 159,000 | 2,486,000 | 5,442,000 | 8,087,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Profit |  |  |  |  |  |  |  | 0 | 46,175,000 | 46,175,000 | (159,000) | 4,388,000 | 9,057,000 | 13,286,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation | 190,469,000 | 276,707,000 | 565,772,000 | 796,233,000 |  |  |  | 0 | 16,202,000 | 16,202,000 | 0 | 4,903,000 | 6,102,000 | 11,005,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
General and Administrative Expense | 9,968,000 | 14,437,000 | 41,296,000 | 47,017,000 |  |  |  | 1,000 | 34,000 | 35,000 | 0 | 1,000 | 205,000 | 206,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income | 243,269,000 | 120,396,000 | 670,825,000 | 288,619,000 |  |  |  | (1,000) | 29,939,000 | 29,938,000 | (159,000) | (516,000) | 2,750,000 | 2,075,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest and Other Income | 576,000 | 1,015,000 | 3,213,000 | 1,767,000 |  |  |  | 0 | 10,000 | 10,000 | 0 | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Nonoperating Income (Expense) |  |  |  |  |  |  |  | 0 | (54,000) | (54,000) | 0 | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Expense, Debt | 118,251,000 | 120,035,000 | 347,224,000 | 437,452,000 |  |  |  | 0 | (11,708,000) | (11,708,000) | 0 | (3,905,000) | (3,422,000) | (7,327,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of Financing Costs | (2,628,000) | (4,335,000) | (8,554,000) | (15,636,000) |  |  |  | 0 | (266,000) | (266,000) | 0 | 0 | (81,000) | (81,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) before income and other taxes, (loss) from investments in unconsolidated entities, net gain (loss) on sales of land parcels, discontinued operations and net gain on sales of real estate properties | 117,995,000 | (7,327,000) | 311,099,000 | (190,420,000) |  |  |  | (1,000) | 17,921,000 | 17,920,000 | (159,000) | (4,421,000) | (753,000) | (5,333,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income and other tax (expense) benefit | (260,000) | (492,000) | (1,146,000) | (1,325,000) |  |  |  | 0 | (45,000) | (45,000) | 0 | (7,000) | 0 | (7,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) from investments in unconsolidated entities | (1,176,000) | (3,209,000) | (10,201,000) | (57,749,000) |  |  |  | 0 | (1,273,000) | (1,273,000) | 0 | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 231,190,000 | $ 391,717,000 | $ 431,642,000 | $ 1,789,483,000 |  |  |  | $ (1,000) | $ 16,603,000 | $ 16,602,000 | $ (159,000) | $ (4,428,000) | $ (753,000) | $ (5,340,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Carrying value as of the balance sheet date of obligations incurred and payable pertaining to goods and services received from vendors, are incurred in connection with contractual obligations or accumulate over time and for which invoices have not yet been received or will not be rendered. + References No definition available. + Details
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- Definition The cumulative amount of depreciation for real estate property held for investment purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(3)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 7 + Details
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- Definition Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition This element represents money paid in advance to protect the provider of a product or service, such as a lessor, against damage or nonpayment by the buyer or tenant (lessee) during the term of the agreement. Such damages may include physical damage to the property, theft of property, and other contractual breaches. Security deposits held may be interest or noninterest bearing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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