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BENEFIT PLANS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net actuarial loss recognized in accumulated other comprehensive income (loss) |  | $ 1,968 | $ 1,550 |
Amounts recognized in balance sheets [Abstract] |  |  |  |
Current liabilities |  | (365) | (369) |
Noncurrent liabilities |  | (7,834) | (7,305) |
Total amount recognized in balance sheet |  | (8,199) | (7,674) |
Net pension cost [Abstract] |  |  |  |
Amortization of prior service cost | [1] | 0 | 0 | $ (432)
Amortization of actuarial loss | [1] | $ (90) | (102) | (169)
Curtailment loss recognized |  |  |  | 222
SERP [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Percentage of final average earnings as annual benefits |  | 55.00% |  |
Maximum amount of annual retirement benefits |  | $ 125 |  |
Change in benefit obligation [Roll Forward] |  |  |  |
Benefit obligation at beginning of the year |  | 7,674 | 7,719 |
Interest cost |  | 321 | 341 | 314
Actuarial losses (gains) |  | 509 | (72) |
Benefits paid |  | (305) | (314) |
Benefit obligation at end of year |  | 8,199 | 7,674 | 7,719
Change in plan assets [Roll Forward] |  |  |  |
Employer contribution |  | 305 | 314 |
Benefits paid |  | (305) | (314) |
Fair value of plan assets at end of year |  | 0 | 0 |
Funded status of the plan - (underfunded) |  | (8,199) | (7,674) |
Accumulated benefit obligations |  | 8,199 | 7,674 |
Net pension cost [Abstract] |  |  |  |
Service cost-benefits earned during the period |  | 0 | 0 | 129
Interest cost on projected benefit obligation |  | 321 | 341 | 314
Amortization of prior service cost |  | 0 | 0 | 210
Amortization of actuarial loss |  | 90 | 102 | 169
Curtailment loss recognized |  | 0 | 0 | 222
Net pension costs |  | 411 | $ 443 | $ 1,044
Estimated amount that will be amortized from accumulated other comprehensive loss into net periodic cost |  | $ 143 |  |
[1] | These amounts are included in the computation of net periodic pension costs and were reclassified to selling, general and administrative costs. For 2015, this includes $222,000 in curtailment loss on the SERP.

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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