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ACCUMULATED OTHER COMPREHENSIVE LOSS - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
BALANCE $ 690,506 $ 659,054 $ 528,468
Other comprehensive gain (loss) before reclassification (3,311) (6,431) (2,168)
Reclassification to net income [1] 2,548 1,661 1,370
TOTAL OTHER COMPREHENSIVE LOSS (763) (4,770) (798)
BALANCE 811,449 690,506 659,054
Unrealized gain (loss) on available-for-sale securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
BALANCE 10 (258) (246)
Other comprehensive gain (loss) before reclassification 181 268 (12)
TOTAL OTHER COMPREHENSIVE LOSS 181 268 (12)
BALANCE 191 10 (258)
Net unrealized gain (loss) on retirement plan [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
BALANCE [2] (16,198) (11,169) (10,355)
Other comprehensive gain (loss) before reclassification [2] (3,492) (6,690) (2,184)
Reclassification to net income [1],[2] 2,523 1,661 1,370
TOTAL OTHER COMPREHENSIVE LOSS [2] (969) (5,029) (814)
BALANCE [2] (17,167) (16,198) (11,169)
Change in cumulative foreign currency translation adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
BALANCE (46) (37) (65)
Other comprehensive gain (loss) before reclassification   (9) 28
Reclassification to net income [1] 25    
TOTAL OTHER COMPREHENSIVE LOSS 25 (9) 28
BALANCE (21) (46) (37)
Accumulated Other Comprehensive Loss [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
BALANCE (16,234) (11,464) (10,666)
TOTAL OTHER COMPREHENSIVE LOSS (763) (4,770) (798)
BALANCE $ (16,997) $ (16,234) $ (11,464)
[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 $2.5 million, $1.7 million and $1.4 million for the years ended December 31, 2019, 2018 and 2017, respectively.
[2] Refer to Note 15: Employee Retirement Plans