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ACCUMULATED OTHER COMPREHENSIVE LOSS - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
BALANCE $ 846,697 $ 716,201 $ 811,449 $ 690,506
Other comprehensive gain (loss) before reclassification     938 160
Reclassification to net income [1]     1,278 1,269
TOTAL OTHER COMPREHENSIVE (LOSS) INCOME (244) 715 2,216 1,429
BALANCE 839,770 751,033 839,770 751,033
Unrealized gain (loss) on available-for-sale debt securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
BALANCE     191 10
Other comprehensive gain (loss) before reclassification     968 151
TOTAL OTHER COMPREHENSIVE (LOSS) INCOME     968 151
BALANCE 1,159 161 1,159 161
Net unrealized gain (loss) on retirement plan [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
BALANCE [2]     (17,167) (16,198)
Reclassification to net income [1],[2]     1,278 1,269
TOTAL OTHER COMPREHENSIVE (LOSS) INCOME [2]     1,278 1,269
BALANCE [2] (15,889) (14,929) (15,889) (14,929)
Change in cumulative foreign currency translation adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
BALANCE     (21) (46)
Other comprehensive gain (loss) before reclassification     (30) 9
TOTAL OTHER COMPREHENSIVE (LOSS) INCOME     (30) 9
BALANCE (51) (37) (51) (37)
Accumulated Other Comprehensive Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
BALANCE (14,537) (15,520) (16,997) (16,234)
TOTAL OTHER COMPREHENSIVE (LOSS) INCOME (244) 715 2,216 1,429
BALANCE $ (14,781) $ (14,805) $ (14,781) $ (14,805)
[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 $1.3 million for both six-month periods ended June 30, 2020 and 2019.
[2] Refer to Note 14: Supplemental Executive Retirement Plan