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Quarterly Financial Data: (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 14, 2014 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Quarterly Financial Data (Unaudited) |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 320,758 | $ 326,262 | $ 322,794 | $ 318,335 | $ 322,909 | $ 263,491 | $ 254,336 | $ 264,511 | $ 1,288,149 | $ 1,105,247 | $ 1,029,475
Net income (loss) attributable to common stockholders |  | $ 414,959 | $ 33,597 | $ 14,395 | $ 24,611 | $ 1,429,221 | $ 35,914 | $ 16,088 | $ 17,819 | $ 487,562 | $ 1,499,042 | $ 420,090
Net income attributable to common stockholders per share-basic (in dollars per share) |  | $ 2.65 | $ 0.21 | $ 0.09 | $ 0.15 | $ 9.52 | $ 0.25 | $ 0.11 | $ 0.13 | $ 3.08 | $ 10.46 | $ 3.01
Net income attributable to common stockholders per share-diluted (in dollars per share) |  | $ 2.65 | $ 0.21 | $ 0.09 | $ 0.15 | $ 9.51 | $ 0.25 | $ 0.11 | $ 0.13 | $ 3.08 | $ 10.45 | $ 3.00
Remeasurement gain on acquisition of additional interest |  |  |  |  |  |  |  |  |  | $ 22,089 | $ 1,423,136 | $ 51,205
Gain (loss) from sale |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 286,414
PPR Queens Portfolio |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data (Unaudited) |  |  |  |  |  |  |  |  |  |  |  |
Remeasurement gain on acquisition of additional interest | $ 1,423,136 | $ 1,423,136 |  |  |  |  |  |  |  |  |  |

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