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Long-Term Debt - Notes Narrative (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Mar. 10, 2017 | Jun. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |  |
Debt Instrument Percentage Of Outstanding Principal Amount Redeemable Upon Event Of Default |  | 25.00% |  |
Debt outstanding |  | $ 757,684,000 | $ 757,684,000 | $ 714,968,000
Maximum Borrowing 2019 Mortgage Facility |  | $ 112,200,000 | $ 112,200,000 |
Mortgage notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt weighted average interest rate on note |  | 3.56% | 3.56% |
Debt outstanding |  | $ 398,600,000 | $ 398,600,000 |
5.0% Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate |  | 5.00% | 5.00% |
6.125% Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Notes Redemption Price Percentage Of Par Value Due To Change Of Control | 101.00% |  |  |
Stated interest rate | 6.125% | 6.125% | 6.125% |
Principal amount | $ 250,000,000.0 |  |  |
Notes issued, percent of principal | 100.00% |  |  |
Maximum dividend (usd per share) |  | $ 0.12 | $ 0.12 |
2019 Mortgage Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate |  | 2.50% | 2.50% |
Maximum dividend (usd per share) |  | $ 0.10 | $ 0.10 |
Long Term Debt Prepayment |  | $ 500,000 | $ 500,000 |
Debt Instrument, Unused Borrowing Capacity, Amount |  | $ 3,100,000 | $ 3,100,000 |
Percent of Collateralized Real Estate |  | 75.00% | 75.00% |
Minimum | 5.0% Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument Other Outstanding Indebtedness In Excess |  | $ 50,000,000.0 |  |
Minimum | 2019 Mortgage Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 0.50% |
Debt Instrument, Basis Spread LIBOR |  |  | 1.50% |
Maximum | 2019 Mortgage Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.75% |
Debt Instrument, Basis Spread LIBOR |  |  | 2.75% |

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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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