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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Debt Disclosure [Abstract] |  |  |  |
Interest expense | $ 7,179 | $ 8,045 | $ 14,573 | $ 15,941
Interest income | (116) | (675) | (582) | (1,433)
Capitalized interest | 0 | (5,165) | (1,182) | (10,205)
Net interest expense | $ 7,063 | $ 2,205 | $ 12,809 | $ 4,303

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