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Investments - Narratives (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
investment
Dec. 31, 2018
USD ($)
investment
Dec. 31, 2017
USD ($)
Schedule of Cost-method Investments        
Gain on previously held shares of equity investment $ (20,800,000) $ 0 $ (20,767,000) $ 0
Net loans and advances to affiliates     0  
Impairments   $ 0 0 0
Affiliated Entity        
Schedule of Cost-method Investments        
Sales to affiliates     16,500,000 59,300,000
Purchases from related party     $ 1,000,000.0 $ 4,000,000.0
Cost-method investment        
Schedule of Cost-method Investments        
Number of investments | investment   6 6  
Equity method investment        
Schedule of Cost-method Investments        
Equity method investment ownership percentage       50.00%