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ACCUMULATED OTHER COMPREHENSIVE LOSS - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
BALANCE $ 716,201,000 $ 642,649,000 $ 690,506,000 $ 659,054,000
Other comprehensive gain (loss) before reclassification     160,000 169,000
Reclassification to net income [1]     1,269,000 844,000
TOTAL OTHER COMPREHENSIVE INCOME 715,000 517,000 1,429,000 1,013,000
BALANCE 751,033,000 650,681,000 751,033,000 650,681,000
Unrealized gain (loss) on available-for-sale securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
BALANCE     10,000 (258,000)
Other comprehensive gain (loss) before reclassification     151,000 171,000
TOTAL OTHER COMPREHENSIVE INCOME     151,000 171,000
BALANCE 161,000 (87,000) 161,000 (87,000)
Net unrealized gain (loss) on retirement plan [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
BALANCE [2]     (16,198,000) (11,169,000)
Reclassification to net income [1],[2]     1,269,000 844,000
TOTAL OTHER COMPREHENSIVE INCOME [2]     1,269,000 844,000
BALANCE [2] (14,929,000) (10,325,000) (14,929,000) (10,325,000)
Change in cumulative foreign currency translation adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
BALANCE     (46,000) (37,000)
Other comprehensive gain (loss) before reclassification     9,000 (2,000)
TOTAL OTHER COMPREHENSIVE INCOME     9,000 (2,000)
BALANCE (37,000) (39,000) (37,000) (39,000)
Accumulated Other Comprehensive Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
BALANCE (15,520,000) (10,968,000) (16,234,000) (11,464,000)
TOTAL OTHER COMPREHENSIVE INCOME 715,000 517,000 1,429,000 1,013,000
BALANCE $ (14,805,000) $ (10,451,000) $ (14,805,000) $ (10,451,000)
[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 $1.3 million and $844,000 for the six months ended June 30, 2019 and 2018, respectively.
[2] Refer to Note 14: Supplemental Executive Retirement Plan