Annual report pursuant to Section 13 and 15(d)

Investments in Affiliated Companies - Summarized Balance Sheet (Details)

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Investments in Affiliated Companies - Summarized Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]    
Current assets $ 428,140 $ 569,487
Current liabilities 201,338 270,364
Equity method investments    
Schedule of Equity Method Investments [Line Items]    
Current assets 219,002 248,685
Noncurrent assets 254,416 256,104
Current liabilities 66,423 52,638
Noncurrent liabilities $ 36,788 $ 5,950