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Favorable Lease Assets - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |
Finite-lived intangible assets, amortization expense | $ 200 | $ 100 | $ 500 | $ 300 |
Favorable lease asset | 46,216 |  | 46,216 |  | $ 26,690
Off-Market Favorable Lease |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Accumulated amortization | 3,200 |  | 3,200 |  | $ 2,700
Hotel Palomar Phoenix Ground Lease | Off-Market Favorable Lease |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Favorable lease asset | $ 20,000 |  | $ 20,000 |  |

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