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Summary of Significant Accounting Policies Narrative (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Accounting Policies [Line Items] |  |  |
Lease cancellation fees | $ 13,600,000 | $ 7,700,000 | $ 2,000,000
Deferred revenue | 4,100,000 | 4,100,000 |
Advertising and marketing expense | 7,600,000 | 9,400,000 | 8,700,000
Capitalized interest | $ 500,000 | $ 0 | $ 0
Number of reportable segments (segment) | segment | 2 |  |
Remaining contractual payments under ground lease agreements | $ 61,284,000 |  |
Capitalized internal leasing costs | $ 2,600,000 |  |
Building and Building Improvements [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Useful life | 39 years |  |
Corporate Equipment [Member] | Minimum [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Useful life | 3 years |  |
Corporate Equipment [Member] | Maximum [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Useful life | 7 years |  |

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- Definition Deferred Costs, Leasing, Internal Costs, Gross + References No definition available. + Details
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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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- Definition Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.3) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 + Details
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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References 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=82846649&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=77902758&loc=d3e41502-112717 + Details
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