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Combined Guarantor Subsidiaries - Summary of Significant Accounting Policies - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |
Restricted cash related to mortgage escrows | [1] | $ 28,511,000 | $ 30,769,000 |  | $ 28,511,000 | $ 30,769,000 |
Net deferred financing costs |  | 17,640,000 |  |  | 17,640,000 |  |
Guarantor Subsidiaries |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |
Amortization of intangible assets |  | 505,000 | 391,000 |  | 1,796,000 | 1,653,000 |
Estimated total net amortization expense of intangible assets for remainder of 2019 |  | 517,000 |  |  | 517,000 |  |
Estimated total net amortization expense of intangible assets in 2020 |  | 1,603,000 |  |  | 1,603,000 |  |
Estimated total net amortization expense of intangible assets in 2021 |  | 1,212,000 |  |  | 1,212,000 |  |
Estimated total net amortization expense of intangible assets in 2022 |  | 991,000 |  |  | 991,000 |  |
Estimated total net amortization expense of intangible assets in 2023 |  | 680,000 |  |  | 680,000 |  |
Estimated total net amortization expense of intangible assets in 2024 |  | 614,000 |  |  | 614,000 |  |
Interest expense capitalized |  | 157,000 | 155,000 |  | 353,000 | 553,000 |
Restricted cash related to mortgage escrows |  | 4,127,000 | 3,182,000 |  | 4,127,000 | 3,182,000 | $ 7,139,000
Net deferred financing costs |  | 174,000 |  |  | 174,000 |  | 361,000
Amortization expense related to deferred financing costs |  | 62,000 | $ 62,000 |  | 186,000 | $ 201,000 |
Accumulated amortization of deferred financing costs |  | 1,278,000 |  |  | 1,278,000 |  | $ 1,092,000
Income tax provision |  | $ 0 |  |  | $ 0 |  |
Customer Concentration Risk | Sales Revenue, Net | Guarantor Subsidiaries |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |
Concentration risk (less than) |  | 10.00% |  | 10.00% |  |  |
Building | Guarantor Subsidiaries |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |
Useful life of property, plant and equipment |  |  |  |  | 40 years |  |
Improvements | Minimum | Guarantor Subsidiaries |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |
Useful life of property, plant and equipment |  |  |  |  | 10 years |  |
Improvements | Maximum | Guarantor Subsidiaries |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |
Useful life of property, plant and equipment |  |  |  |  | 20 years |  |
Equipment and Fixtures | Minimum | Guarantor Subsidiaries |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |
Useful life of property, plant and equipment |  |  |  |  | 7 years |  |
Equipment and Fixtures | Maximum | Guarantor Subsidiaries |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |
Useful life of property, plant and equipment |  |  |  |  | 10 years |  |
[1] | Included in intangible lease assets and other assets in the condensed consolidated balance sheets.

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