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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance $ 1,274,911 $ 1,241,081 $ 1,211,018 $ 1,311,192
Other comprehensive loss 3,256   (5,168)  
Other comprehensive income (loss), net of tax 3,256 (332) (5,168) (8,338)
Ending balance 1,294,500 1,263,168 1,294,500 1,263,168
Unrealized Gains (Losses) on Investments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance 283   283  
Other comprehensive loss 0   0  
Other comprehensive income (loss), net of tax 0   0  
Ending balance 283   283  
Foreign Currency Translation        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (63,513)   (55,089)  
Other comprehensive loss 3,256   (5,168)  
Other comprehensive income (loss), net of tax 3,256   (5,168)  
Ending balance (60,257)   (60,257)  
Total        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (63,230) (54,468) (54,806) (46,462)
Other comprehensive income (loss), net of tax 3,256 (332) (5,168) (8,338)
Ending balance $ (59,974) $ (54,800) $ (59,974) $ (54,800)