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Fair Value Measurements (Narrative) (Details) € in Millions, gal in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2022 USD ($) € / shares $ / gal | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) € / shares $ / gal gal | Sep. 30, 2021 USD ($) | Sep. 30, 2022 EUR (€) € / shares $ / gal | Dec. 31, 2021 USD ($) | May 31, 2021 USD ($)
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |
Derivative, nonmonetary notional amount, volume | gal |  |  | 5.3 |  |  |  |
Fair value hedge assets | $ 512,000 |  | $ 512,000 |  |  | $ 630,000 |
Reclassification of derivative (gains) losses to earnings net of tax |  |  | (9,754,000) |  |  |  |
Fair value hedge liabilities | 1,442,000 |  | 1,442,000 |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 325,000,000
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |
Fair value of debt | $ 250,445,000 |  | $ 250,445,000 |  |  |  |
Minimum [Member] |  |  |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |
Fixed price range | $ / gal | 1.91 |  | 1.91 |  | 1.91 |  |
Maximum [Member] |  |  |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |
Fixed price range | $ / gal | 3.95 |  | 3.95 |  | 3.95 |  |
Fuel Hedge Contracts [Member] |  |  |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |
Derivative underlying hedge percent |  |  | 80.00% |  |  |  |
Reclassification of derivative (gains) losses to earnings net of tax | $ (2,358,000) | $ (1,793,000) | $ (9,558,000) | $ (5,197,000) |  |  |
Foreign Currency Exchange Hedge Contracts [Member] |  |  |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |
Reclassification of derivative (gains) losses to earnings net of tax | $ (196,000) |  | (196,000) |  |  |  |
Reclassification of derivative (gains) losses to earnings net of cash settlements and taxes |  |  | $ 0 |  |  |  |
Derivative notional amount | € |  |  |  |  | € 17.5 |  |
Fair value hedges |  |  |  |  |  | $ 0 |
Foreign Currency Exchange Hedge Contracts [Member] | Minimum [Member] |  |  |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |
Fixed price range | € / shares | 0.97 |  | 0.97 |  | 0.97 |  |
Foreign Currency Exchange Hedge Contracts [Member] | Maximum [Member] |  |  |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |
Fixed price range | € / shares | 1.13 |  | 1.13 |  | 1.13 |  |

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