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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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Quarterly Financial Data.

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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.

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Amount after tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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