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Favorable Lease Assets - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2015 USD ($) | Dec. 31, 2017 USD ($) room | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2017 USD ($) | Feb. 28, 2017 USD ($)
Indefinite-lived Intangible Assets by Major Class [Line Items] |  |  |  |  |  |
Amortization of intangible assets |  | $ 400 | $ 300 | $ 500 |  |
Amortization in 2018 |  | 400 |  |  |  |
Amortization in 2019 |  | 400 |  |  |  |
Amortization in 2020 |  | 400 |  |  |  |
Amortization in 2021 |  | 400 |  |  |  |
Amortization in 2022 |  | 400 |  |  |  |
Write off of assets |  | 3,209 | 0 | 10,461 |  |
Off-Market Favorable Lease |  |  |  |  |  |
Indefinite-lived Intangible Assets by Major Class [Line Items] |  |  |  |  |  |
Accumulated amortization |  | $ 2,700 | $ 2,300 |  |  |
Off-Market Favorable Lease | Orchards Inn Sedona Annex Sublease |  |  |  |  |  |
Indefinite-lived Intangible Assets by Major Class [Line Items] |  |  |  |  |  |
Carrying amount of the lease right |  |  |  |  | $ 9,100 | $ 9,100
Above Market Lease Rights | Westin Boston Waterfront Hotel Ground Lease |  |  |  |  |  |
Indefinite-lived Intangible Assets by Major Class [Line Items] |  |  |  |  |  |
Impairment of favorable lease asset | $ 9,600 |  |  |  |  |
Above Market Lease Rights | Lexington Hotel New York Tenant Leases |  |  |  |  |  |
Indefinite-lived Intangible Assets by Major Class [Line Items] |  |  |  |  |  |
Impairment of favorable lease asset |  |  |  | $ 800 |  |
Prepaid Expenses and Other Current Assets | Above Market Lease Rights | Westin Boston Waterfront Hotel Ground Lease |  |  |  |  |  |
Indefinite-lived Intangible Assets by Major Class [Line Items] |  |  |  |  |  |
Write off of assets | $ 600 |  |  |  |  |
Minimum | Above Market Lease Rights | Westin Boston Waterfront Hotel Ground Lease |  |  |  |  |  |
Indefinite-lived Intangible Assets by Major Class [Line Items] |  |  |  |  |  |
Number of room hotel for development for which favorable lease assets are owned | room |  | 320 |  |  |  |
Maximum | Above Market Lease Rights | Westin Boston Waterfront Hotel Ground Lease |  |  |  |  |  |
Indefinite-lived Intangible Assets by Major Class [Line Items] |  |  |  |  |  |
Number of room hotel for development for which favorable lease assets are owned | room |  | 350 |  |  |  |

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