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Fair Value Measures (Tables)
 3 Months Ended
Mar. 31, 2021
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 March 31, 2021 are as follows:
(in thousands)Level 1Level 2Level 3Total
Assets:
Cash equivalents:
Money market funds$344,886 $— $— $344,886 
United States government treasury bills— 45,000 — 45,000 
Short-term investments:
Money market funds99 — — 99 
Mutual fund shares821 — — 821 
Other current assets:
Derivative financial instruments— 4,197 — 4,197 
Non-current assets:
Money market funds 3,667 — — 3,667 
Mutual fund shares 15,376 — — 15,376 
Derivative financial instruments— 6,159 — 6,159 
Total assets measured at fair value$364,849 $55,356 $— $420,205 
Liabilities:
Accrued liabilities:
Derivative financial instruments$— $6,701 $— $6,701 
Other long-term liabilities:
Derivative financial instruments— 2,337 — 2,337 
Total liabilities measured at fair value$— $9,038 $— $9,038 
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 — — 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 March 31, 2020 are as follows:
(in thousands)Level 1Level 2Level 3Total
Assets:
Cash equivalents:
Money market funds$128,488 $— $— $128,488 
United States government treasury bills— 44,973 — 44,973 
Available-for-sale short-term investments:(1)
United States government treasury bills — 35,032 — 35,032 
Other short-term investments:
Money market funds14 — — 14 
Mutual fund shares782 — — 782 
Other current assets:
Derivative financial instruments— 23,394 — 23,394 
Non-current assets:
Money market funds 3,674 — — 3,674 
Mutual fund shares 9,329 — — 9,329 
Derivative financial instruments— 10,520 — 10,520 
Total assets measured at fair value$142,287 $113,919 $— $256,206 
Liabilities:
Accrued liabilities:
Derivative financial instruments$— $1,209 $— $1,209 
Total liabilities measured at fair value$— $1,209 $— $1,209 
(1) Investments have remaining maturities of less than one year.