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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS
12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS
Marketable Debt Securities
At December 31, 2020, current available-for-sale marketable debt securities were as follows:
Amortized CostGross Unrealized GainsGross Unrealized LossesFair Value
(In thousands)
Treasury discount notes$49,995 $— $— $49,995 
Total available-for-sale marketable debt securities$49,995 $— $— $49,995 
The contractual maturities of debt securities classified as current available-for-sale at December 31, 2020 are within one year. The Company did not hold any available-for-sale marketable debt securities at December 31, 2019.
For the years ended December 31, 2020 and 2019, proceeds from maturities of available-for-sale marketable debt securities were $50.0 million and $25.0 million, respectively. There were no gross realized gains or losses from the maturities of available-for-sale marketable debt securities for the years ended December 31, 2020 and 2019.
Fair Value Measurements
The following tables present the Company’s financial instruments that are measured at fair value on a recurring basis:
December 31, 2020
Quoted Market
Prices in Active
Markets for
Identical Assets
(Level 1)
Significant
Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Total
Fair Value
Measurements
(In thousands)
Assets:
Cash equivalents:
Money market funds $374,014 $— $— $374,014 
Treasury discount notes— 324,995 — 324,995 
Time deposits— 2,721 — $2,721 
Marketable debt securities:
Treasury discount notes— 49,995 — 49,995 
Total $374,014 $377,711 $— $751,725 
December 31, 2019
Quoted Market
Prices in Active
Markets for
Identical Assets
(Level 1)
Significant
Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Total
Fair Value
Measurements
(In thousands)
Assets:
Cash equivalents:
Money market funds $291,810 $— $— $291,810 
Time deposits— 23,040 — 23,040 
Total $291,810 $23,040 $— $314,850 
Financial instruments measured at fair value only for disclosure purposes
The following table presents the carrying value and the fair value of financial instruments measured at fair value only for disclosure purposes:
December 31, 2020December 31, 2019
Carrying ValueFair ValueCarrying ValueFair Value
(In thousands)
Current portion of long-term debt$— $— $(13,750)$(13,681)
Long-term debt, net(a)
(712,277)(725,700)(231,946)(232,581)
_________________
(a)    At December 31, 2020 and 2019, the carrying value of long-term debt, net includes unamortized debt issuance costs of $7.7 million and $1.8 million, respectively.
The fair value of long-term debt, including the current portion, is estimated using observable market prices or indices for similar liabilities, which are Level 2 inputs