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Debt (Narrative) (Details) - USD ($) | 9 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Dec. 29, 2029 | Dec. 28, 2028 | Feb. 25, 2028 | Feb. 25, 2027 | Aug. 08, 2026 | Feb. 25, 2026 | Aug. 08, 2025 | Feb. 25, 2025 | Aug. 08, 2024 | Feb. 25, 2024 | Dec. 31, 2022 | Feb. 09, 2022 | Feb. 07, 2022 | Dec. 15, 2015 | Jul. 30, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Document Period End Date | Sep. 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.15% |  |  |
Payments of Debt Issuance Costs | $ 72,000 | $ 86,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Costs associated with amendment | 1,983,000 |  |  |  |  |  |  |  |  |  |  |  | $ 2,605,000 |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | 35,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, net | 336,112,000 |  |  |  |  |  |  |  |  |  |  |  | 335,825,000 |  |  |  |
Letters of Credit Outstanding, Amount | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |
Long-Term Debt, Percentage Bearing Fixed Interest, Percentage Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.60% |  |
Notes payable | 12,998,000 |  |  |  |  |  |  |  |  |  |  |  | 14,622,000 |  | $ 14,400,000 |  |
2026 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, net | 75,000,000 |  |  |  |  |  |  |  |  |  |  |  | 75,000,000 |  |  |  |
2027 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, net | 37,500,000 |  |  |  |  |  |  |  |  |  |  |  | 37,500,000 |  |  |  |
2028 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, net | 125,000,000 |  |  |  |  |  |  |  |  |  |  |  | 125,000,000 |  |  |  |
2029 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, net | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Costs associated with amendment | 1,388,000 |  |  |  |  |  |  |  |  |  |  |  | 1,675,000 |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 325,000,000 | $ 35,000,000
Borrowings on lines of credit | $ 0 |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |
Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five |  |  | $ 70,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt, Maturity, Year Two |  |  |  |  |  |  |  |  | $ 12,500,000 | $ 25,000,000 |  |  |  |  |  |  |
Long-Term Debt, Maturity, Year Four |  |  |  |  |  | $ 25,000,000 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt, Maturity, Year One |  |  |  |  |  |  |  |  |  |  | $ 12,500,000 | $ 25,000,000 |  |  |  |  |
Long-Term Debt, Maturity, Year Three |  |  |  |  |  |  | $ 50,000,000 | $ 25,000,000 |  |  |  |  |  |  |  |  |
Long-Term Debt, Maturity, Year Five |  |  |  | $ 30 | $ 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |

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