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ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME - Summary of components of accumulated other comprehensive (loss) income (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance |  | $ (16,702) | $ (18,102)
Change during the period: |  |  |
Before-tax amount |  | (430) | 198
Tax benefit |  |  | 12
Reclassification adjustment, net of taxes: |  |  |
Amortization of net loss | [1] | 328 | 270
Total activity for the period |  | (102) | 480
Balance |  | (16,804) | (17,622)
Pension Adjustment |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance |  | (14,470) | (15,503)
Change during the period: |  |  |
Before-tax amount |  | 0 | 0
Reclassification adjustment, net of taxes: |  |  |
Amortization of net loss | [1] | 328 | 270
Total activity for the period |  | 328 | 270
Balance |  | (14,142) | (15,233)
Unrealized Gain (Loss) On Securities |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance |  | 15 | 39
Change during the period: |  |  |
Before-tax amount |  | (15) | (33)
Tax benefit |  |  | 12
Reclassification adjustment, net of taxes: |  |  |
Amortization of net loss | [1] | 0 | 0
Total activity for the period |  | (15) | (21)
Balance |  | 0 | 18
Foreign Currency Translation |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance |  | (2,247) | (2,638)
Change during the period: |  |  |
Before-tax amount |  | (415) | 231
Reclassification adjustment, net of taxes: |  |  |
Amortization of net loss | [1] | 0 | 0
Total activity for the period |  | (415) | 231
Balance |  | $ (2,662) | $ (2,407)
[1] | Reported as part of selling, general and administrative expenses.

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e681-108580 + Details
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