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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Accounting Policies [Line Items] |  |
Capitalized non-contingent leasing costs |  | $ 4,500
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% |
Ground lease agreements |  |
Accounting Policies [Line Items] |  |
Remaining contractual payments under ground lease agreements | $ 76,268 |

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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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