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Marketable Securities (Tables)
 12 Months Ended
Dec. 31, 2020
Debt Securities, Available-for-sale [Abstract]  
Cash equivalents and marketable securities classified as available-for-sale Total cash, cash equivalents and marketable securities are summarized as follows:
As of December 31, 2020
(Dollars in thousands)Fair ValueAmortized CostGross Unrealized GainsGross Unrealized LossesWeighted Rate of Return
Money market funds$32,815 $32,815 $— $— 0.01 %
U.S. Government bonds and notes169,880 169,920 3 (43)0.12 %
Corporate notes, bonds and commercial paper238,491 238,509 61 (79)0.21 %
Total cash equivalents and marketable securities
441,186 441,244 64 (122)
Cash61,463 61,463 — — 
Total cash, cash equivalents and marketable securities
$502,649 $502,707 $64 $(122)
As of December 31, 2019
(Dollars in thousands)Fair ValueAmortized CostGross Unrealized GainsGross Unrealized LossesWeighted Rate of Return
Money market funds$10,065 $10,065 $— $— 1.48 %
U.S. Government bonds and notes39,086 39,087 — (1)1.49 %
Corporate notes, bonds and commercial paper314,391 314,435 19 (63)1.81 %
Total cash equivalents and marketable securities
363,542363,58719 (64)
Cash44,122 44,122 — — 
Total cash, cash equivalents and marketable securities
$407,664 $407,709 $19 $(64)
Available-for-sale securities reported at fair value Available-for-sale securities are reported at fair value on the balance sheets and classified as follows:
As of December 31,
(In thousands)20202019
Cash equivalents$74,683 $58,054 
Short-term marketable securities366,503 305,488 
Total cash equivalents and marketable securities
441,186363,542
Cash61,463 44,122 
Total cash, cash equivalents and marketable securities
$502,649 $407,664 
Estimated fair value of cash equivalents and marketable securities classified by date of contractual maturity and the length of time that the securities have been in a continuous unrealized loss position
The estimated fair value and gross unrealized losses of cash equivalents and marketable securities classified by the length of time that the securities have been in a continuous unrealized loss position at December 31, 2020 and 2019 are as follows:
Fair ValueGross Unrealized Loss
(In thousands)December 31,
2020		December 31,
2019		December 31,
2020		December 31,
2019
Less than 12 months
U.S. Government bonds and notes$72,896 $14,112 $(43)$(1)
Corporate notes, bonds and commercial paper181,354 250,822 (79)(63)
Total cash equivalents and marketable securities in a continuous unrealized loss position$254,250 $264,934 $(122)$(64)
Contractual maturities of cash equivalents (excluding money market funds which have no maturity) and marketable securities
The contractual maturities of cash equivalents (excluding money market funds which have no maturity) and marketable securities are summarized as follows:
(In thousands)December 31,
2020
Due less than one year$334,332 
Due from one year through three years74,039 
Total$408,371