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Long-Term Debt - Components Of Net Interest Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Debt Disclosure [Abstract] |  |  |  |
Interest expense | $ 6,097 | $ 8,007 | $ 18,152 | $ 22,580
Capitalized interest |  |  |  | (1,182)
Interest income | (169) | (409) | (252) | (991)
Net interest expense | $ 5,928 | $ 7,598 | $ 17,900 | $ 20,407

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