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ACCUMULATED OTHER COMPREHENSIVE LOSS - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
BALANCE $ 912,714 $ 811,449 $ 690,506
Other comprehensive gain (loss) before reclassification 13,348 (21,578) (3,311)
Plan amendment cost (283)    
Reclassification to net income [1] 4,719 2,556 2,548
Other comprehensive loss 17,784 (19,022) (763)
BALANCE 1,099,914 912,714 811,449
Unrealized gain (loss) on available-for-sale securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
BALANCE 91 191 10
Other comprehensive gain (loss) before reclassification (233) (100) 181
Plan amendment cost 0    
Reclassification to net income [1] 0 0 0
Other comprehensive loss (233) (100) 181
BALANCE (142) 91 191
Net unrealized gain (loss) on retirement plan [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
BALANCE [2] (36,075) (17,167) (16,198)
Other comprehensive gain (loss) before reclassification [2] 13,620 (21,464) (3,492)
Plan amendment cost [2] (283)    
Reclassification to net income [1],[2] 4,719 2,556 2,523
Other comprehensive loss [2] 18,056 (18,908) (969)
BALANCE [2] (18,019) (36,075) (17,167)
Change in cumulative foreign currency translation adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
BALANCE (35) (21) (46)
Other comprehensive gain (loss) before reclassification (39) (14) (0)
Plan amendment cost 0    
Reclassification to net income [1] 0 0 25
Other comprehensive loss (39) (14) 25
BALANCE (74) (35) (21)
Accumulated Other Comprehensive Loss [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
BALANCE (36,019) (16,997) (16,234)
Other comprehensive loss 17,784 (19,022) (763)
BALANCE $ (18,235) $ (36,019) $ (16,997)
[1] The Company reclassified amortization of prior service cost, actuarial loss and plan amendment cost for its retirement plan from accumulated other comprehensive loss to net income of $4.7 million, $2.6 million and $2.5 million for the years ended December 31, 2021, 2020 and 2019, respectively.
[2] Refer to Note 17: Employee Retirement Plans