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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% |

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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 + Details
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