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Real Estate and Lease Intangibles - Summary of the Effect of the Amortization for Above and Below Market Ground and Retail Lease Intangibles (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Total amortization of above/below market lease intangibles | $ (4,392) | $ (3,828) | $ (3,426)
Ground Leases [Member] | Property and Maintenance [Member] |  |  |
Total amortization of above/below market lease intangibles | (4,463) | (4,369) | (4,321)
Retail Lease [Member] | Rental Income [Member] |  |  |
Total amortization of above/below market lease intangibles | $ 71 | $ 541 | $ 895

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- Definition Amount of non-cash amortization of intangible asset (liability) for above and below market leases. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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