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SHORT-TERM AND LONG-TERM INVESTMENTS (Tables)

12 Months Ended

Dec. 31, 2020

Investments, Debt and Equity Securities [Abstract]

Summary of Amortized Costs, Gross Unrealized Gains and Losses and Estimated Fair Values of Available-For-Sale Marketable Securities

The following table summarizes amortized costs, gross unrealized gains and losses and estimated fair values of available-for-sale marketable securities as of December 31, 2020 and 2019:

			Amortized cost												Gross unrealized gains												Gross unrealized losses												Estimated fair value (Level 2 within the fair value hierarchy)
			December 31,												December 31,												December 31,												December 31,
			2020						2019						2020						2019						2020						2019						2020						2019
Corporate debentures			$	973,029					$	687,886					$	15,016					$	4,865					$	(343)					$	(271)					$	987,702					$	692,480
U.S. Treasuries			17,613						23,182						418						82						—						(2)						18,031						23,262
U.S. Government Agencies			6,546						19,957						3						38						—						(20)						6,549						19,975
			$	997,188					$	731,025					$	15,437					$	4,985					$	(343)					$	(293)					$	1,012,282					$	735,717

Scheduled Maturities of Available-for-Sale Marketable Securities

The scheduled maturities of available-for-sale marketable securities as of December 31, 2020 are as follows:

			Amortized cost						Estimated fair value
Due within one year			$	135,533					$	136,391
Due after one year through five years			861,655						875,891
			$	997,188					$	1,012,282

Schedule of Unrealized Losses and Fair Values

Investments with continuous unrealized losses for less than 12 months and 12 months or greater and their related fair values as of December 31, 2020 and 2019 are as indicated in the following tables:

			December 31, 2020
			Investments with continuous unrealized losses for less than 12 months												Investments with continuous unrealized losses for 12 months or greater												Total Investments with continuous unrealized losses
			Fair value						Unrealized losses						Fair value						Unrealized losses						Fair value						Unrealized losses
Corporate debentures			$	194,587					$	(337)					$	8,590					$	(6)					$	203,177					$	(343)
U.S. Treasuries			2,936						—						—						—						2,936						—
			$	197,523					$	(337)					$	8,590					$	(6)					$	206,113					$	(343)

			December 31, 2019
			Investments with continuous unrealized losses for less than 12 months												Investments with continuous unrealized losses for 12 months or greater												Total Investments with continuous unrealized losses
			Fair value						Unrealized losses						Fair value						Unrealized losses						Fair value						Unrealized losses
Corporate debentures			$	70,733					$	(117)					$	48,658					$	(154)					$	119,391					$	(271)
U.S. Treasuries			—						—						5,005						(2)						5,005						(2)
U.S. Government Agencies			10,974						(20)						—						—						10,974						(20)
			$	81,707					$	(137)					$	53,663					$	(156)					$	135,370					$	(293)

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- Definition

Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments.

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- Definition

Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value.

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- Definition

For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27290-111563

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