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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands | 6 Months Ended |
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Jun. 30, 2019 | Jan. 01, 2019
Accounting Policies [Line Items] |  |
Operating lease, right-of-use assets | $ 29,404 |
Operating lease, liabilities | 29,404 |
Leasing cost | $ 2,200 |
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% |
ASU 2016-02 |  |
Accounting Policies [Line Items] |  |
Operating lease, right-of-use assets |  | $ 29,500
Operating lease, liabilities |  | $ 29,500

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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