MARKETABLE SECURITIES - Continuous Unrealized Loss Position (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months Estimated Fair Market Value, Total marketable securities	$ 245,800,000		$ 245,800,000
Less Than 12 Months Gross Unrealized Losses, Total marketable securities	(6,188,000)		(6,188,000)
12 Months or Longer Estimated Fair Market Value, Total marketable securities	10,533,000		10,533,000
12 Months or Longer Gross Unrealized Losses, Total marketable securities	(318,000)		(318,000)
Total Estimated Fair Market Value, Total marketable securities	256,333,000		256,333,000
Total Gross Unrealized Losses, Total marketable securities	(6,506,000)		(6,506,000)
Unrealized losses on marketable securities	0	$ 0	0	$ 0
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months Estimated Fair Market Value, Total marketable securities	245,800,000		245,800,000
Less Than 12 Months Gross Unrealized Losses, Total marketable securities	(6,188,000)		(6,188,000)
12 Months or Longer Estimated Fair Market Value, Total marketable securities	10,533,000		10,533,000
12 Months or Longer Gross Unrealized Losses, Total marketable securities	(318,000)		(318,000)
Total Estimated Fair Market Value, Total marketable securities	256,333,000		256,333,000
Total Gross Unrealized Losses, Total marketable securities	$ (6,506,000)		$ (6,506,000)