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Financial Instruments
 12 Months Ended
Dec. 31, 2021
Cash, Cash Equivalents And Marketable Securities [Abstract]  
Cash, Cash Equivalents, and Marketable Securities [Text Block] Financial Instruments
Cash, Cash Equivalents, and Marketable Securities
The following table summarizes the Company’s cash, cash equivalents, and marketable securities and the fair value categorization of the financial instruments measured at fair value on a recurring basis:
As of December 31,
20212020
 (In thousands)
Cash $25,840 $28,832 
Time deposits3,693 4,176 
Money market funds (Level 1)165,586 129,627 
Debt securities issued by the U.S. Treasury (Level 1)1,016,015 1,013,679 
Total$1,211,134 $1,176,314 
Cash and cash equivalents $223,487 $401,194 
Restricted cash (included in Other long-term assets)5,329 9,407 
Total Cash, cash equivalents, and restricted cash228,816 410,601 
Marketable securities 982,318 765,713 
Total$1,211,134 $1,176,314 
The gross and net unrealized gains and losses included in the fair value of the debt securities were not significant for the periods presented. All of the debt securities held as of December 31, 2021 have contractual maturities of less than one year.
Fair Value Measurements
The fair value of the Company’s investments in money market funds approximates their face value. Such instruments are classified as Level 1 and are included in Cash and cash equivalents. The fair value of the debt securities consisting of U.S. Treasury bills is based on their quoted market prices and are classified as Level 1.
As of December 31, 2021, the Company’s other financial instruments include cash, accounts receivable, restricted cash, and accounts payable whose carrying values approximated their fair values. The fair values of the Company’s senior notes due 2025 (the “2025 Senior Notes”), the senior notes due 2027 (the “2027 Senior Notes”), and the senior notes due 2031 (the “2031 Senior Notes”) were $552.3 million, $573.9 million, and $755.5 million, respectively, as of December 31, 2021. The fair values of these debt instruments are based on available market information from public data sources and are classified as Level 2.