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v3.21.1

Summary of Significant Accounting Policies (Details) | Mar. 31, 2021
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Minimum |
Accounting Policies [Line Items] |
Observatory revenue realized during the first quarter, previous ten years (as a percent) | 16.00%
Observatory revenue realized during the second quarter, previous ten years (as a percent) | 26.00%
Observatory revenue realized during the third quarter, previous ten years (as a percent) | 31.00%
Observatory revenue realized during the fourth quarter, previous ten years (as a percent) | 23.00%
Maximum |
Accounting Policies [Line Items] |
Observatory revenue realized during the first quarter, previous ten years (as a percent) | 18.00%
Observatory revenue realized during the second quarter, previous ten years (as a percent) | 28.00%
Observatory revenue realized during the third quarter, previous ten years (as a percent) | 33.00%
Observatory revenue realized during the fourth quarter, previous ten years (as a percent) | 25.00%

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- Definition Historical Revenue Trend, Observatory Revenue, in Quarter Four Over Ten Year Period, Percent + References No definition available. + Details
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- Definition Historical Revenue Trend, Observatory Revenue, in Quarter Two Over Ten Year Period, Percent + References No definition available. + Details
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