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Debt (Schedule Of Debt) (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020 | Mar. 02, 2020 | Aug. 03, 2016
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Unamortized debt issuance costs | $ (3,280,000) | $ (4,000,000) |  |
Finance lease liabilities | 8,382,000 | 9,966,000 |  |
Total debt | 275,665,000 | 276,529,000 |  |
Less: current maturities | 16,328,000 | 16,910,000 |  |
Total long-term debt | 259,337,000 | 259,619,000 |  |
2020 Term Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Term loan | $ 270,563,000 | $ 270,563,000 | $ 300,000,000 |
2016 Term Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Term loan |  |  |  | $ 400,000,000

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