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Fair Value Measures (Tables)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
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, 2021 are as follows:

(in thousands)Level 1Level 2Level 3Total
Assets:
Cash equivalents:
Money market funds$2,677 $— $— $2,677 
Available-for-sale short-term investments:(1)
U.S. Government treasury bills— 130,168 — 130,168 
Other short-term investments:
Money market funds73 — — 73 
Mutual fund shares904 — — 904 
Other current assets:
Derivative financial instruments— 9,397 — 9,397 
Non-current assets:
Money market funds 2,219 — — 2,219 
Mutual fund shares 19,606 — — 19,606 
Derivative financial instruments— 10,142 — 10,142 
Total assets measured at fair value$25,479 $149,707 $— $175,186 
Liabilities:
Accrued liabilities:
Derivative financial instruments$— $3,572 $— $3,572 
Other long-term liabilities
Derivative financial instruments— 318 — 318 
Total liabilities measured at fair value$— $3,890 $— $3,890 
(1) Available-for-sale short-term investments have remaining maturities of less than one year.
Assets and liabilities measured at fair value on a recurring basis at 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 — 0— 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