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Investments in Affiliated Companies - Rollforward (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Equity Method Investments |  |
Balance at beginning of period | $ 458,128 | $ 471,338
Equity in net income of affiliated companies | 34,216 | 27,699
Amortization of investment in affiliate step-up | (6,480) | (6,634)
Dividends received from affiliated companies | (35,000) | (40,000)
Foreign currency translation adjustments | (4,790) | 5,725
Balance at end of period | $ 446,074 | $ 458,128

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