ACCUMULATED OTHER COMPREHENSIVE LOSS - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($)		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
BALANCE		$ 1,275,369,000	$ 1,099,914,000
Other comprehensive gain (loss) before reclassification		2,722,000	(4,169,000)
Reclassification to net income	[1]	253,000	509,000
TOTAL OTHER COMPREHENSIVE INCOME (LOSS)		2,975,000	(3,660,000)
BALANCE		1,299,465,000	1,131,300,000
Unrealized gain (loss) on available-for-sale securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
BALANCE		(7,887,000)	(142,000)
Other comprehensive gain (loss) before reclassification		2,627,000	(3,935,000)
Reclassification to net income	[1]	0	0
TOTAL OTHER COMPREHENSIVE INCOME (LOSS)		2,627,000	(3,935,000)
BALANCE		(5,260,000)	(4,077,000)
Net unrealized gain (loss) on retirement plan [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
BALANCE	[2]	(10,011,000)	(18,019,000)
Other comprehensive gain (loss) before reclassification	[2]	0	0
Reclassification to net income	[1],[2]	253,000	509,000
TOTAL OTHER COMPREHENSIVE INCOME (LOSS)	[2]	253,000	509,000
BALANCE	[2]	(9,758,000)	(17,510,000)
Change in cumulative foreign currency translation adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
BALANCE		(554,000)	(74,000)
Other comprehensive gain (loss) before reclassification		95,000	(234,000)
Reclassification to net income	[1]	0	0
TOTAL OTHER COMPREHENSIVE INCOME (LOSS)		95,000	(234,000)
BALANCE		(459,000)	(308,000)
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
BALANCE		(18,452,000)	(18,235,000)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS)		2,975,000	(3,660,000)
BALANCE		$ (15,477,000)	$ (21,895,000)

[1] The Company reclassified amortization of prior service cost and actuarial loss for its retirement plan from accumulated other comprehensive loss to net income of $253,000 and $509,000 for the three months ended March 31, 2023 and 2022, respectively.

[2] Refer to Note 17: Retirement Plan Benefit Liability.