Annual report pursuant to Section 13 and 15(d)

Investments in Affiliated Companies - Narratives (Details)

v3.8.0.1
Investments in Affiliated Companies - Narratives (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition    
Charges related to purchase accounting fair value adjustments $ 8,599 $ 36,296
Equity Method Investee    
Business Acquisition    
Due from related parties 4,910 4,196
Related party sales 2,853 1,587
Purchases from related party 2,475 1,147
Business Combination    
Business Acquisition    
Purchase accounting fair value adjustments $ 264,700 $ 273,300