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Summary of Significant Accounting Policies Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Accounting Policies [Line Items]
Capitalized internal leasing costs		$ 2,300
Minimum
Accounting Policies [Line Items]
Percent of observatory revenue in first quarter over a ten year period	16.00%
Percent of observatory revenue in second quarter over a ten year period	26.00%
Percent of observatory revenue in third quarter over a ten year period	31.00%
Percent of observatory revenue in fourth quarter over a ten year period	23.00%
Maximum
Accounting Policies [Line Items]
Percent of observatory revenue in first quarter over a ten year period	18.00%
Percent of observatory revenue in second quarter over a ten year period	28.00%
Percent of observatory revenue in third quarter over a ten year period	33.00%
Percent of observatory revenue in fourth quarter over a ten year period	25.00%
Ground lease
Accounting Policies [Line Items]
Remaining payments on ground leases	$ 62,422

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[Line Items] for Accounting Policies [Table]

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Deferred Costs, Leasing, Internal Costs, Gross

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Historical Revenue Trend, Observatory Revenue, in Quarter Four Over Ten Year Period, Percent

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Historical Revenue Trend, Observatory Revenue, in Quarter One Over Ten Year Period, Percent

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Historical Revenue Trend, Observatory Revenue, in Quarter Three Over Ten Year Period, Percent

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Historical Revenue Trend, Observatory Revenue, in Quarter Two Over Ten Year Period, Percent

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 55
-Paragraph 40
-Subparagraph (Note 3)
-URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717

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