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Long-Term Debt - Components Of Net Interest Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Debt Disclosure [Abstract] |  |  |  |
Interest expense | $ 5,943 | $ 7,179 | $ 12,055 | $ 14,573
Capitalized interest |  |  |  | (1,182)
Interest income | (24) | (116) | (83) | (582)
Net interest expense | $ 5,919 | $ 7,063 | $ 11,972 | $ 12,809

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