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Quarterly Financial Data (Unaudited): (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended | 3 Months Ended | 0 Months Ended
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Oct. 26, 2012 | Jun. 03, 2011 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Oct. 26, 2012 Arrowhead Towne Center | Dec. 31, 2013 Arrowhead Towne Center | Dec. 11, 2013 Chesterfield Towne Center
Quarterly Financial Data (Unaudited) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  | $ 282,137 | $ 258,154 | $ 245,877 | $ 243,307 | $ 229,207 | $ 195,799 | $ 185,055 | $ 187,456 | $ 1,029,475 | $ 797,517 | $ 684,744 |  |  |
Net income (loss) attributable to common stockholders |  |  | 144,878 | 38,123 | 218,997 | 18,092 | 174,247 | 43,893 | 133,354 | (14,068) | 420,090 | 337,426 | 156,866 |  |  |
Net income (loss) attributable to common stockholders per share-basic (in dollars per share) |  |  | $ 1.03 | $ 0.27 | $ 1.57 | $ 0.13 | $ 1.27 | $ 0.33 | $ 1.00 | $ (0.11) | $ 3.01 | $ 2.51 | $ 1.18 |  |  |
Net income (loss) attributable to common stockholders per share-diluted (in dollars per share) |  |  | $ 1.03 | $ 0.27 | $ 1.57 | $ 0.13 | $ 1.27 | $ 0.33 | $ 1.00 | $ (0.11) | $ 3.00 | $ 2.51 | $ 1.18 |  |  |
Gain (loss) from sale |  |  |  |  |  |  |  |  |  |  | 286,414 | 50,811 | (58,333) |  |  | 151,467
Remeasurement gain on acquisition of additional interest | $ 115,729 | $ 1,734 |  |  |  |  |  |  |  |  |  |  |  | $ 115,729 | $ 115,729 |

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- Definition In a business combination achieved in stages, this element represents the amount of net gain (loss) recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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