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ACCUMULATED OTHER COMPREHENSIVE LOSS - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
BALANCE     $ 659,054  
Other comprehensive gain (loss) before reclassification     204 $ 145
Actuarial loss       (1,945)
Reclassification to net income [1]     1,266 1,007
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) $ 457 $ 112 1,470 (793)
BALANCE 675,507   675,507  
Unrealized gain (loss) on available-for-sale securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
BALANCE     (258) (246)
Other comprehensive gain (loss) before reclassification     214 117
TOTAL OTHER COMPREHENSIVE INCOME (LOSS)     214 117
BALANCE (44) (129) (44) (129)
Net unrealized gain (loss) on retirement plan [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
BALANCE [2]     (11,169) (10,355)
Actuarial loss [2]       (1,945)
Reclassification to net income [1],[2]     1,266 1,007
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) [2]     1,266 (938)
BALANCE [2] (9,903) (11,293) (9,903) (11,293)
Change in cumulative foreign currency translation adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
BALANCE     (37) (65)
Other comprehensive gain (loss) before reclassification     (10) 28
TOTAL OTHER COMPREHENSIVE INCOME (LOSS)     (10) 28
BALANCE (47) (37) (47) (37)
Accumulated Other Comprehensive Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
BALANCE     (11,464) (10,666)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS)     1,470  
BALANCE $ (9,994) $ (11,459) $ (9,994) $ (11,459)
[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 $1.0 million for the nine months ended September 30, 2018 and 2017, respectively.
[2] Refer to Note 12: Supplemental Executive Retirement Plan.