Annual report pursuant to Section 13 and 15(d)

Reportable Segments - Narratives (Details)

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Reportable Segments - Narratives (Details)
$ in Thousands
12 Months Ended
Mar. 01, 2019
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Segment Reporting [Abstract]        
Number of operating segments 4 4 2  
Reportable segments 4 4 2  
Equity in net income from affiliated companies   $ 46,034 $ 37,611 $ 38,772