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Long-Term Debt - Notes Narrative (Details) - USD ($) |  | 6 Months Ended |
--- | --- | --- | ---
Mar. 10, 2017 | Jun. 30, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |
Debt outstanding |  | $ 697,236,000 | $ 727,930,000
Maximum Borrowing 2019 Mortgage Facility |  | 112,200,000 |
Maximum Borrowing 2020 Line of Credit Facility |  | 54,100,000 |
Remaining Availability 2020 LOC |  | 54,100,000 |
Outstanding Balance 2020 LOC |  | $ 0 |
Mortgage notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt weighted average interest rate on note |  | 3.54% |
Debt outstanding |  | $ 351,800,000 |
5.0% Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 5.00% |
6.125% Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 6.125% | 6.125% |
Principal amount | $ 250,000,000.0 |  |
Notes issued, percent of principal | 100.00% |  |
2019 Mortgage Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maximum dividend (usd per share) |  | $ 0.12 |
Debt Instrument, Unused Borrowing Capacity, Amount |  | $ 16,700,000 |
Percent of Collateralized Real Estate |  | 75.00% |
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 Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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