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Investments in Affiliated Companies Narrative (Details) - Business Combination - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
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