MARKETABLE SECURITIES (Marketable Securities Unrealized Loss Position) (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months Estimated Fair Market Value, Total marketable securities	$ 274,380,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1,186,000)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0
12 Months or Longer Gross Unrealized Losses, Total marketable securities	0
Total Estimated Fair Market Value, Total marketable securities	274,380,000
Total Gross Unrealized Losses, Total marketable securities	(1,186,000)
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	$ 0
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months Estimated Fair Market Value, Total marketable securities	274,380,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1,186,000)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0
12 Months or Longer Gross Unrealized Losses, Total marketable securities	0
Total Estimated Fair Market Value, Total marketable securities	274,380,000
Total Gross Unrealized Losses, Total marketable securities	$ (1,186,000)