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Real Estate Real Estate Intangible Assets Amortization Table (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | May 15, 2017
--- | --- | ---
Acquired Finite-Lived Intangible Assets [Line Items] |  |
2018 | $ 27,333 |
2019 | 14,464 |
2020 | 8,777 |
2021 | $ 4,758 |
103 Carnegie Center [Member] | Acquired in-place lease intangibles |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Period from May 15, 2017 through December 31, 2017 |  | $ 660
2018 |  | 590
2019 |  | 367
2020 |  | 243
2021 |  | 96
103 Carnegie Center [Member] | Acquired below-mark lease intangible |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Period from May 15, 2017 through December 31, 2017 |  | (248)
2018 |  | (363)
2019 |  | (337)
2020 |  | (308)
2021 |  | $ (105)

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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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