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Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Equity Securities    
Beginning balance   $ 78,900
New investments   103,200
Move from investment in equity securities to equity method investment   0
(Decrease) increase in fair value of investments in equity securities   1,200
Equity in earnings   100
Foreign currency translation (losses) gains   (3,600)
Ending balance $ 179,800 179,800
Equity Method Investments    
Equity Securities    
Beginning balance   5,300
New investments   58,200
Move from investment in equity securities to equity method investment   36,400
(Decrease) increase in fair value of investments in equity securities   0
Equity in earnings   100
Foreign currency translation (losses) gains   (1,600)
Ending balance 98,400 98,400
Investment in Equity Securities Level 1    
Equity Securities    
Beginning balance   53,800
New investments   0
Move from investment in equity securities to equity method investment   0
(Decrease) increase in fair value of investments in equity securities (6,000) (25,800)
Equity in earnings   0
Foreign currency translation (losses) gains   (2,300)
Ending balance 25,700 25,700
Investment in Equity Securities, Level 2    
Equity Securities    
Beginning balance   4,100
New investments   0
Move from investment in equity securities to equity method investment   0
(Decrease) increase in fair value of investments in equity securities (4,300) 6,300
Equity in earnings   0
Foreign currency translation (losses) gains   0
Ending balance 10,400 10,400
Investments in Equity Securities, All Others    
Equity Securities    
Beginning balance   15,700
New investments   45,000
Move from investment in equity securities to equity method investment   (36,400)
(Decrease) increase in fair value of investments in equity securities   20,700
Equity in earnings   0
Foreign currency translation (losses) gains   300
Ending balance $ 45,300 $ 45,300