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Related Party Transactions (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Jan. 31, 2018
LCIF [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Redemption of OP units (in units) |  |  | 2,675,785 |  |
Redemption of OP units |  |  | $ 129,990 |  |
General and administrative expense |  | $ 4,993 | 4,911 |  |
Property operating expenses |  | 403 | 515 |  |
Lexington Realty Trust [Member] | LCIF [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Maximum amount to be distributed from (to) related party |  | (4,494) |  | $ (2,422) |
Unit distributions earned |  | 43,026 | $ 46,732 |  |
Redemption of OP units (in units) | 2,675,785 |  |  |  |
Distribution amount (in dollars per unit) | $ 3.25 |  | $ 3.25 |  |
Redemption of OP units | $ 129,990 |  |  |  |
Interest expense |  | $ 7,168 | $ 5,913 |  |
Affiliated Entity [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Notes payable, related party |  |  |  | 8,000 | $ 500
Affiliated Entity [Member] | LCIF [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Notes payable, related party |  |  |  | 8,000 | $ 500
Expense Reimbursement [Member] | Affiliated Entity [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Property operating expenses |  |  |  | 105 |
Expense Reimbursement [Member] | Affiliated Entity [Member] | LCIF [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Property operating expenses |  |  |  | 105 |
Structuring Fee [Member] | Affiliated Entity [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Property operating expenses |  |  |  | 128 |
Structuring Fee [Member] | Affiliated Entity [Member] | LCIF [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Property operating expenses |  |  |  | $ 128 |

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