MARKETABLE SECURITIES (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Payable to brokers	$ 2.2	$ 9.3
Short-term Investments [Member] | Maximum [Member]
Debt Securities, Available-for-sale [Line Items]
Contractual Maturity	1 year	1 year
Long-term Investments [Member] | Minimum [Member]
Debt Securities, Available-for-sale [Line Items]
Contractual Maturity	1 year	1 year
Long-term Investments [Member] | Maximum [Member]
Debt Securities, Available-for-sale [Line Items]
Contractual Maturity	3 years	3 years