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Summary of Significant Accounting Policies Narrative (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 01, 2019 USD ($)
Accounting Policies [Line Items] |  |  |  |
Deferred revenue | $ 4,100,000 | $ 4,100,000 |  |
Advertising and marketing expense | 8,900,000 | 7,600,000 | $ 9,400,000 |
Capitalized interest | $ 1,600,000 | $ 500,000 | $ 0 |
Number of reportable segments (segment) | segment | 2 |  |  |
Remaining contractual payments under ground lease agreements | $ 75,888,000 |  |  |
Capitalized internal leasing costs | $ 4,600,000 |  |  |
Building and Building Improvements |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Useful life (in years) | 39 years |  |  |
Corporate Equipment | Minimum |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Useful life (in years) | 3 years |  |  |
Corporate Equipment | Maximum |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Useful life (in years) | 7 years |  |  |
Subsequent event | ASU 2016-02 |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Operating lease, right-of-use assets |  |  |  | $ 30,000,000
Operating lease, liabilities |  |  |  | $ 30,000,000

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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