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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance $ 641,498  
Amounts reclassified from accumulated other comprehensive income (loss) to consolidated net (loss) income:    
Total other comprehensive (loss) income, net of tax (2,966) $ (2,251)
Ending balance 655,091  
Marketable Investments    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance 647 238
Other comprehensive (loss) income before reclassifications:    
Other comprehensive income before reclassifications (353) (689)
Income tax effect — expense 82 72
Net of tax (271) (617)
Amounts reclassified from accumulated other comprehensive income (loss) to consolidated net (loss) income:    
Realized gain (loss) — marketable investments 0 0
Income tax effect — expense (benefit) 0 0
Net of tax 0 0
Total other comprehensive (loss) income, net of tax (271) (617)
Ending balance 376 (379)
Currency Translation Adjustments    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance 1,894 (2,562)
Other comprehensive (loss) income before reclassifications:    
Other comprehensive income before reclassifications (2,695) (1,634)
Income tax effect — expense 0 0
Net of tax (2,695) (1,634)
Amounts reclassified from accumulated other comprehensive income (loss) to consolidated net (loss) income:    
Realized gain (loss) — marketable investments 0 0
Income tax effect — expense (benefit) 0 0
Net of tax 0 0
Total other comprehensive (loss) income, net of tax (2,695) (1,634)
Ending balance (801) (4,196)
Total    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance 2,541 (2,324)
Other comprehensive (loss) income before reclassifications:    
Income tax effect — expense 82 72
Net of tax (2,966) (2,251)
Amounts reclassified from accumulated other comprehensive income (loss) to consolidated net (loss) income:    
Realized gain (loss) — marketable investments 0 0
Income tax effect — expense (benefit) 0 0
Net of tax 0 0
Total other comprehensive (loss) income, net of tax (2,966) (2,251)
Ending balance $ (425) $ (4,575)