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Investments (Details) - USD ($)
$ in Thousands
6 Months Ended
Feb. 25, 2021
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Schedule of Investments [Line Items]        
Non-cash proceeds from divestitures   $ 244,530 $ 0  
Fine Chemistry Services        
Schedule of Investments [Line Items]        
Preferred Stock, Value, Outstanding $ 270,000      
Preferred Stock, Dividend Rate, Percentage 12.00%      
Windfield Holdings        
Schedule of Investments [Line Items]        
Equity method investment, ownership percentage   49.00%    
Carrying value of unconsolidated investment   $ 485,900   $ 479,600
Other variable interest entities        
Schedule of Investments [Line Items]        
Carrying value of unconsolidated investment   $ 8,100   $ 8,000