Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accounting Policies [Line Items]
Public relations costs	$ 0.3	$ 0.7	$ 1.3	$ 1.1
Minimum
Accounting Policies [Line Items]
Percent of observatory revenue in first quarter over a ten year period	16.00%		16.00%
Percent of observatory revenue in second quarter over a ten year period	26.00%		26.00%
Percent of observatory revenue in third quarter over a ten year period	31.00%		31.00%
Percent of observatory revenue in fourth quarter over a ten year period	23.00%		23.00%
Maximum
Accounting Policies [Line Items]
Percent of observatory revenue in first quarter over a ten year period	18.00%		18.00%
Percent of observatory revenue in second quarter over a ten year period	28.00%		28.00%
Percent of observatory revenue in third quarter over a ten year period	33.00%		33.00%
Percent of observatory revenue in fourth quarter over a ten year period	25.00%		25.00%

[Line Items] for Accounting Policies [Table]

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- Definition

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

+ References

No definition available.

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- Definition

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

+ References

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- Definition

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

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- Definition

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

+ References

No definition available.

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- Definition

Expenditures for planning and executing the conception, pricing, promotion, and distribution of ideas, goods, and services. Costs of public relations and corporate promotions are typically considered to be marketing costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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