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Fair Value Measures (Tables)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value Disclosures [Abstract]    
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets and liabilities measured at fair value on a recurring basis as of December 31, 2020 are as follows:
(in thousands)Level 1Level 2Level 3Total
Assets:
Cash equivalents:
Money market funds$119,378 $— $— $119,378 
United States government treasury bills— 234,982 — 234,982 
Short-term investments:
Money market funds105 — — 105 
Mutual fund shares1,119 — — 1,119 
Other current assets:
Derivative financial instruments— 2,597 — 2,597 
Non-current assets:
Money market funds 4,059 — — 4,059 
Mutual fund shares 14,657 — — 14,657 
Derivative financial instruments— 1,126 — 1,126 
Total assets measured at fair value$139,318 $238,705 $— $378,023 
Liabilities:
Accrued liabilities:
Derivative financial instruments$— $9,841 $— $9,841 
Other long-term liabilities
Derivative financial instruments— 6,590 — 6,590 
Total liabilities measured at fair value$— $16,431 $— $16,431 
Assets and liabilities measured at fair value on a recurring basis at December 31, 2019 are as follows:
(in thousands)Level 1Level 2Level 3Total
Assets:
Cash equivalents:
Money market funds$288,926 $— $— $288,926 
United States government treasury bills— 34,928 — 34,928 
Commercial paper— 33,587 — 33,587 
Short-term investments:
Mutual fund shares1,668 — — 1,668 
Other current assets:
Derivative financial instruments— 14,001 — 14,001 
Non-current assets:
Money market funds 1,792 — — 1,792 
Mutual fund shares 12,172 — — 12,172 
Derivative financial instruments— 4,159 — 4,159 
Total assets measured at fair value$304,558 $86,675 $— $391,233 
Liabilities:
Accrued liabilities:
Derivative financial instruments$— $2,266 $— $2,266 
Other long-term liabilities:
Derivative financial instruments— 768 — 768 
Total liabilities measured at fair value$— $3,034 $— $3,034