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8. Fair Value Measurements (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Assets:    
Marketable securities $ 264,691 $ 155,495
Restricted marketable securities 211,130 198,310
Foreign debt [Member]    
Assets:    
Marketable securities 0 34,895
U.S. debt [Member]    
Assets:    
Marketable securities 8,822 44,089
Time deposits [Member]    
Assets:    
Marketable securities 255,869 76,511
Fair Value, Measurements, Recurring [Member]    
Assets:    
Cash equivalents, Money market funds 402,381 1,105,684
Restricted cash equivalents, Money market funds 4,463 6,192
Restricted marketable securities 211,130 198,310
Derivative assets 2,228 1,778
Total assets 884,893 1,467,459
Liabilities:    
Derivative liabilities 3,071 1,744
Fair Value, Measurements, Recurring [Member] | Foreign debt [Member]    
Assets:    
Marketable securities   34,895
Fair Value, Measurements, Recurring [Member] | U.S. debt [Member]    
Assets:    
Marketable securities 8,822 44,089
Fair Value, Measurements, Recurring [Member] | Time deposits [Member]    
Assets:    
Marketable securities 255,869 76,511
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets:    
Cash equivalents, Money market funds 402,381 1,105,684
Restricted cash equivalents, Money market funds 4,463 6,192
Restricted marketable securities 0 0
Derivative assets 0 0
Total assets 662,713 1,188,387
Liabilities:    
Derivative liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign debt [Member]    
Assets:    
Marketable securities   0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. debt [Member]    
Assets:    
Marketable securities 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Time deposits [Member]    
Assets:    
Marketable securities 255,869 76,511
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets:    
Cash equivalents, Money market funds 0 0
Restricted cash equivalents, Money market funds 0 0
Restricted marketable securities 211,130 198,310
Derivative assets 2,228 1,778
Total assets 222,180 279,072
Liabilities:    
Derivative liabilities 3,071 1,744
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign debt [Member]    
Assets:    
Marketable securities   34,895
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. debt [Member]    
Assets:    
Marketable securities 8,822 44,089
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Time deposits [Member]    
Assets:    
Marketable securities 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets:    
Cash equivalents, Money market funds 0 0
Restricted cash equivalents, Money market funds 0 0
Restricted marketable securities 0 0
Derivative assets 0 0
Total assets 0 0
Liabilities:    
Derivative liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign debt [Member]    
Assets:    
Marketable securities   0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | U.S. debt [Member]    
Assets:    
Marketable securities 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Time deposits [Member]    
Assets:    
Marketable securities $ 0 $ 0