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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
BALANCE $ 952,468 $ 846,697 $ 912,714 $ 811,449
Other comprehensive gain (loss) before reclassification     (101) 938
Reclassification to net income [1]     2,348 1,278
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) 1,237 (244) 2,247 2,216
BALANCE 991,616 839,770 991,616 839,770
Unrealized gain (loss) on available-for-sale securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
BALANCE     91 191
Other comprehensive gain (loss) before reclassification     (32) 968
TOTAL OTHER COMPREHENSIVE INCOME (LOSS)     (32) 968
BALANCE 59 1,159 59 1,159
Net unrealized gain (loss) on retirement plan [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
BALANCE [2]     (36,075) (17,167)
Reclassification to net income [1],[2]     2,348 1,278
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) [2]     2,348 1,278
BALANCE [2] (33,727) (15,889) (33,727) (15,889)
Change in cumulative foreign currency translation adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
BALANCE     (35) (21)
Other comprehensive gain (loss) before reclassification     (69) (30)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS)     (69) (30)
BALANCE (104) (51) (104) (51)
Accumulated Other Comprehensive Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
BALANCE (35,009) (14,537) (36,019) (16,997)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) 1,237 (244) 2,247 2,216
BALANCE $ (33,772) $ (14,781) $ (33,772) $ (14,781)
[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 $2.3 million and $1.3 million for the six months ended June 30, 2021 and 2020.
[2] Refer to Note 14: Supplemental Executive Retirement Plan