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Debt (Narrative) (Details) - USD ($) | 6 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2023 | Jun. 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 | Jun. 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.15% |  |  |
Payments of Debt Issuance Costs | $ 72,000 | $ 86,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Costs associated with amendment | 2,214,000 |  |  |  |  |  |  |  |  |  |  |  | $ 2,605,000 |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | 35,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 336,016,000 |  |  |  |  |  |  |  |  |  |  |  | 335,825,000 |  |  |  |
Letters of Credit Outstanding, Amount | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |
Long-Term Debt, Percentage Bearing Fixed Interest, Percentage Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.60% |  |
Other Notes Payable | 14,591,000 |  |  |  |  |  |  |  |  |  |  |  | 14,622,000 |  | $ 14,400,000 |  |
2026 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 75,000,000 |  |  |  |  |  |  |  |  |  |  |  | 75,000,000 |  |  |  |
2027 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 37,500,000 |  |  |  |  |  |  |  |  |  |  |  | 37,500,000 |  |  |  |
2028 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 125,000,000 |  |  |  |  |  |  |  |  |  |  |  | 125,000,000 |  |  |  |
2029 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Costs associated with amendment | $ 1,484,000 |  |  |  |  |  |  |  |  |  |  |  | $ 1,675,000 |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 325,000,000 | $ 35,000,000
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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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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