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Financial Instruments - Interest Rate Risk (Details) - USD ($) $ in Thousands	12 Months Ended
	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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- Definition

Sensitivity Analysis Of Interest Rate Risk Income Statement Impact, Impact Of Change In Average Variable Rate On Interest Income

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Sensitivity Analysis Of Interest Rate Risk Income Statement Impact, Impact Of Change In Average Variable Rate On Interest Income, Percent

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The net amount of nonoperating interest income (expense).

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