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8. Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Fair value of assets and liabilities measured on a recurring basis
At March 31, 2021 and December 31, 2020, the fair value measurements of our assets and liabilities measured on a recurring basis were as follows (in thousands):
  Fair Value Measurements at Reporting
Date Using
 
 
 
 
 
 		March 31,
2021		Quoted Prices
in Active
Markets for
Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Assets:
Cash equivalents:
Money market funds$2 $2 $— $— 
Marketable securities:
Foreign debt194,101 — 194,101 — 
U.S. debt18,764 — 18,764 — 
Time deposits349,870 349,870 — — 
Derivative assets7,745 — 7,745 — 
Total assets$570,482 $349,872 $220,610 $— 
Liabilities:
Derivative liabilities$2,938 $— $2,938 $— 

  Fair Value Measurements at Reporting
Date Using
 
 
 
 
 
 		December 31,
2020		Quoted Prices
in Active
Markets for
Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Assets:    
Cash equivalents:
Money market funds$2 $2 $— $— 
Marketable securities:
Foreign debt214,254 — 214,254 — 
U.S. debt14,543 — 14,543 — 
Time deposits291,269 291,269 — — 
Restricted marketable securities265,280 — 265,280 — 
Derivative assets3,315 — 3,315 — 
Total assets$788,663 $291,271 $497,392 $— 
Liabilities:
Derivative liabilities$5,621 $— $5,621 $— 
Carrying value and fair value of financial instruments not measured at fair value
At March 31, 2021 and December 31, 2020, the carrying values and fair values of our financial instruments not measured at fair value were as follows (in thousands):
 March 31, 2021December 31, 2020
 
 		Carrying
Value		Fair
Value		Carrying
Value		Fair
Value
Assets:    
Accounts receivable, unbilled - noncurrent$53,281 $47,767 $22,722 $22,096 
Liabilities:
Long-term debt, including current maturities (1)$264,427 $262,442 $287,149 $297,076 
——————————
(1)Excludes unamortized discounts and issuance costs.