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Combined Guarantor Subsidiaries - Summary of Significant Accounting Policies - Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Financial Statements Captions [Line Items] |  |  |  |
Amortization of intangible assets |  | $ 4,506,000 | $ 13,282,000 | $ 13,256,000
Future amortization expense, 2020 |  | 1,848,000 |  |
Future amortization expense, 2021 |  | 1,256,000 |  |
Future amortization expense, 2022 |  | 1,003,000 |  |
Future amortization expense, 2023 |  | 804,000 |  |
Future amortization expense, 2024 |  | 786,000 |  |
Interest expense capitalized |  | 2,504,000 | 3,225,000 | 2,314,000
Restricted cash related to mortgage escrows | [1] | 26,062,000 | 28,562,000 | 34,625,000
Provision for doubtful accounts |  | 3,463,000 | 4,817,000 | 3,782,000
Unamortized deferred financing costs |  | 16,148,000 | 15,963,000 |
Amortization expense |  | 7,000,000 | 6,120,000 | 5,918,000
Accumulated amortization of deferred financing costs |  | $ 17,175,000 | 22,098,000 |
Customer Concentration Risk |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |
Concentration risk (as a percent) |  | 4.50% |  |
Certain Improvements | Minimum |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |
Useful life of property, plant and equipment |  | 10 years |  |
Certain Improvements | Maximum |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |
Useful life of property, plant and equipment |  | 20 years |  |
Guarantor Subsidiaries |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |
Amortization of intangible assets |  | $ 2,346,000 | 2,394,000 | 4,622,000
Future amortization expense, 2020 |  | 1,595,000 |  |
Future amortization expense, 2021 |  | 1,204,000 |  |
Future amortization expense, 2022 |  | 984,000 |  |
Future amortization expense, 2023 |  | 672,000 |  |
Future amortization expense, 2024 |  | 612,000 |  |
Interest expense capitalized |  | 505,000 | 705,000 | 598,000
Restricted cash related to mortgage escrows |  | 4,134,000 | 3,413,000 | 6,065,000
Restricted cash related to mortgage escrows |  |  | 7,139,000 |
Provision for doubtful accounts |  | 2,072,000 | 1,236,000 | 1,564,000
Unamortized deferred financing costs |  | 112,000 | 361,000 |
Amortization expense |  | 249,000 | 264,000 | $ 399,000
Accumulated amortization of deferred financing costs |  | 1,340,000 | $ 1,092,000 |
Income tax provision |  | $ 0 |  |
Guarantor Subsidiaries | Customer Concentration Risk | Sales Revenue, Net |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |
Concentration risk (as a percent) |  | 10.00% |  |
Guarantor Subsidiaries | ASC 842 |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |
Provision for doubtful accounts |  | $ 2,072,000 |  |
Guarantor Subsidiaries | Building |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |
Useful life of property, plant and equipment |  | 40 years |  |
Guarantor Subsidiaries | Certain Improvements | Minimum |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |
Useful life of property, plant and equipment |  | 10 years |  |
Guarantor Subsidiaries | Certain Improvements | Maximum |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |
Useful life of property, plant and equipment |  | 20 years |  |
Guarantor Subsidiaries | Equipment and Fixtures | Minimum |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |
Useful life of property, plant and equipment |  | 7 years |  |
Guarantor Subsidiaries | Equipment and Fixtures | Maximum |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |
Useful life of property, plant and equipment |  | 10 years |  |
[1] |
| (1) | Included in intangible lease assets and other assets in the consolidated balance sheets

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