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Schedule-II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Year | $ 19,865 |  | $ 202
Additions Charged Against Operations | 324 |  | 19,711
Uncollectible accounts Written-off | (19,596) |  | (48)
Balance at End of Year | 593 |  | 19,865
Allowance for Doubtful Accounts [Member] |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Year | 277 |  | 202
Additions Charged Against Operations | 324 |  | 123
Uncollectible accounts Written-off | (8) |  | (48)
Balance at End of Year | 593 | [1] | 277
Allowance for Preferred Equity Investments [Member] |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Year | 19,588 |  |
Additions Charged Against Operations |  |  | 19,588
Uncollectible accounts Written-off | $ (19,588) |  |
Balance at End of Year |  |  | $ 19,588
[1] | Represents allowance for tenant receivables arising from operating leases. The allowance was written-off on January 1, 2019 upon the adoption of ASU 2016-02, an update to ASC Topic 842, Leases, which requires companies to account for impairment of receivables as reduction to “rental income” if the collectability of these receivables is not probable.

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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