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Investments in Affiliated Companies Narrative (Details) - Business Combination - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Business Combination |  |  |  |  |
Net purchase accounting fair value adjustments | $ 240,620 |  | $ 240,620 |  | $ 243,899
Amortization of investment in affiliate step-up | $ 1,620 | $ 1,659 | $ 3,278 | $ 3,317 |

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