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SHORT-TERM AND LONG-TERM INVESTMENTS (Summary of Amortized Costs, Gross Unrealized Gains and Losses and Estimated Fair Values of Available-For-Sale Marketable Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 997,188	$ 731,025
Gross unrealized gains	15,437	4,985
Gross unrealized losses	(343)	(293)
Estimated fair value (Level 2 within the fair value hierarchy)	1,012,282	735,717
Fair Value, Inputs, Level 2 | Corporate debentures
Debt Securities, Available-for-sale [Line Items]
Amortized cost	973,029	687,886
Gross unrealized gains	15,016	4,865
Gross unrealized losses	(343)	(271)
Estimated fair value (Level 2 within the fair value hierarchy)	987,702	692,480
Fair Value, Inputs, Level 2 | U.S. Treasuries
Debt Securities, Available-for-sale [Line Items]
Amortized cost	17,613	23,182
Gross unrealized gains	418	82
Gross unrealized losses	0	(2)
Estimated fair value (Level 2 within the fair value hierarchy)	18,031	23,262
Fair Value, Inputs, Level 2 | U.S. Government Agencies
Debt Securities, Available-for-sale [Line Items]
Amortized cost	6,546	19,957
Gross unrealized gains	3	38
Gross unrealized losses	0	(20)
Estimated fair value (Level 2 within the fair value hierarchy)	$ 6,549	$ 19,975

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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