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Financial Instruments - Interest Rate Risk Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Investments, All Other Investments [Abstract]
Interest income, net	$ 3,734	$ 9,442	$ 11,485	$ 11,528
Impact of change in average variable rate, percent	(0.73%)		(1.45%)
Impact of change in average variable rate, amount	$ 2,090		$ 7,292

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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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