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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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