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Long-Term Debt - Notes Narrative (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Mar. 10, 2017 | Dec. 31, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |
Outstanding mortgage principal balance |  | $ 727,930,000 | $ 714,968,000
Outstanding Balance 2020 LOC |  | 0 |
Maximum Borrowing 2020 Line of Credit Facility |  | 57,000,000.0 |
Remaining Availability 2020 LOC |  | 57,000,000.0 |
Long-term Debt, Gross |  | $ 727,930,000 | $ 714,968,000
Mortgage notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt weighted average interest rate on note |  | 3.52% |
Outstanding mortgage principal balance |  | $ 377,000,000.0 |
Long-term Debt, Gross |  | $ 377,000,000.0 |
6.125% Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate on debt agreement | 6.125% | 6.125% | 6.125%
Principal amount | $ 250,000,000.0 |  |
Notes issued at a price of principal amount | 100.00% |  |
Notes redemption price percentage of the par value due to change of control | 101.00% |  |
Debt instrument maximum allowed dividends per share (usd per share) | $ 0.12 |  |
Outstanding principal amount of the 6.125% notes | 25.00% |  |
6.125% Notes | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Indebtedness with outstanding balance under other agreements |  | $ 50,000,000.0 |
2019 Mortgage Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate on debt agreement |  | 2.50% |
DividendRestrictionMaximumAmountPerShare |  | $ 0.10 |
Percent of Collateralized Real Estate |  | 75.00% |
2019 Mortgage Facility [Member] | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Basis Spread LIBOR |  | 2.75% |
Debt Instrument, Basis Spread on Variable Rate |  | 1.75% |
2019 Mortgage Facility [Member] | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Basis Spread LIBOR |  | 1.50% |
Debt Instrument, Basis Spread on Variable Rate |  | 0.50% |

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- Definition Maximum amount per share the entity may pay as quarterly cash dividends on common stock as permitted by the indenture governing the entity's debt obligation. + References No definition available. + Details
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- Definition Minimum amount of outstanding indebtedness the entity or its subsidiaries must have under other agreements in order to allow an acceleration of the entity's debt obligation if certain events of default occur. + References No definition available. + Details
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