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Recent Accounting Pronouncements (Initial Assessment of Revenues) (Details) - Pro Forma - Accounting Standards Update 2014-09 | 9 Months Ended
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Sep. 30, 2017
Revenue stream |
Management, development and leasing fees | 1.00%
Marketing revenues | 1.00%
Total estimated ASC 606 revenues as a percentage of total revenues | 2.00%

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