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Combined Guarantor Subsidiaries - Summary of Significant Accounting Policies - Narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Restricted cash related to mortgage escrows | [1] | $ 24,282,000 | $ 31,977,000 |
Net deferred financing costs |  | 20,071,000 |  |
Guarantor Subsidiaries |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Amortization of intangible assets |  | 626,000 | 726,000 |
Estimated total net amortization expense of intangible assets for remainder of 2019 |  | 1,255,000 |  |
Estimated total net amortization expense of intangible assets in 2020 |  | 1,195,000 |  |
Estimated total net amortization expense of intangible assets in 2021 |  | 1,241,000 |  |
Estimated total net amortization expense of intangible assets in 2022 |  | 1,020,000 |  |
Estimated total net amortization expense of intangible assets in 2023 |  | 706,000 |  |
Estimated total net amortization expense of intangible assets in 2024 |  | 620,000 |  |
Interest expense capitalized |  | 95,000 | 188,000 |
Restricted cash related to mortgage escrows |  | 3,856,000 | 2,970,000 | $ 7,139,000
Net deferred financing costs |  | 299,000 |  | 361,000
Amortization expense related to deferred financing costs |  | 62,000 | $ 77,000 |
Accumulated amortization of deferred financing costs |  | 1,154,000 |  | $ 1,092,000
Income tax provision |  | $ 0 |  |
Concentration risk (less than) |  |  | 4.40% |
Building | Guarantor Subsidiaries |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Useful life of property, plant and equipment |  | 40 years |  |
Minimum | Improvements | Guarantor Subsidiaries |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Useful life of property, plant and equipment |  | 10 years |  |
Minimum | Equipment and Fixtures | Guarantor Subsidiaries |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Useful life of property, plant and equipment |  | 7 years |  |
Maximum | Improvements | Guarantor Subsidiaries |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Useful life of property, plant and equipment |  | 20 years |  |
Maximum | Equipment and Fixtures | Guarantor Subsidiaries |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Useful life of property, plant and equipment |  | 10 years |  |
Customer Concentration Risk | Sales Revenue, Net | Guarantor Subsidiaries |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Concentration risk (less than) |  | 4.10% |  |
[1] | Included in intangible lease assets and other assets in the condensed consolidated balance sheets.

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