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, 2019
Dec. 31, 2018
Equity Method Investments and Joint Ventures [Abstract]    
Current assets $ 249,640 $ 215,416
Noncurrent assets 256,382 248,288
Current liabilities 52,811 40,536
Noncurrent liabilities $ 5,972 $ 56