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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance $ 1,749,030 $ 148,549 $ 63,733  
Accounting Standards Update [Extensible List]       us-gaap:AccountingStandardsUpdate201601Member
Ending balance 1,708,168 1,749,030 148,549 $ 63,733
Accumulated other comprehensive income (loss)        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance 27,838 (9,870) 2,458  
Ending balance 42,999 27,838 (9,870) 2,458
Net unrealized gain (loss) on revaluation and disposal of other investments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance 5 5 446  
Net unrealized (loss) gain 0 0 3  
Ending balance 5 5 5 446
Net unrealized gain (loss) on revaluation and disposal of other investments | Cumulative Effect, Period of Adoption, Adjustment        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance 0 0 (444)  
Ending balance   0 0 (444)
Net foreign exchange gain (loss) on translation of foreign operations        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance 27,833 (9,875) 2,456  
Net unrealized (loss) gain 15,161 37,708 (12,331)  
Ending balance $ 42,994 $ 27,833 $ (9,875) $ 2,456