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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.

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