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Financial Instruments - Interest Rate Risk (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Investments, All Other Investments [Abstract] |  |  |
Interest income, net | $ 18,415 | $ 27,969 | $ 81
Impact of change in average variable rate, percent | 1.49% |  |
Impact of change in average variable rate, amount | $ (15,671) |  |

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