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PENSION AND OTHER POSTRETIREMENT PLANS (Details 2) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Components of net periodic benefit cost and other amounts recognized in other comprehensive income: |  |  |
Total recognized in other comprehensive income | $ 302 | $ 1,452 | $ (196)
Pension Benefits |  |  |
Components of net periodic benefit cost and other amounts recognized in other comprehensive income: |  |  |
Service cost | 1,129 | 1,153 | 1,134
Interest cost | 750 | 794 | 706
Expected return on plan assets | (2,129) | (1,927) | (1,838)
Amortization of net loss | 479 | 406 | 376
Amortization of prior service credit | (77) | (77) | (77)
Amortization of transition obligation | 0 | 0 | 0
Net periodic benefit cost | 152 | 349 | 301
Net loss (gain) | (409) | 1,172 | (123)
Amortization of net loss | (479) | (406) | (376)
Amortization of prior service credit | 77 | 77 | 77
Amortization of transition obligation | 0 | 0 | 0
Total recognized in other comprehensive income | (811) | 843 | (422)
SERP Benefits |  |  |
Components of net periodic benefit cost and other amounts recognized in other comprehensive income: |  |  |
Service cost | 212 | 176 | 168
Interest cost | 105 | 105 | 91
Expected return on plan assets | 0 | 0 | 0
Amortization of net loss | 51 | 27 | 32
Amortization of prior service credit | 0 | 0 | 0
Amortization of transition obligation | 27 | 28 | 28
Net periodic benefit cost | 395 | 336 | 319
Net loss (gain) | 710 | 280 | (48)
Amortization of net loss | (51) | (27) | (32)
Amortization of prior service credit | 0 | 0 | 0
Amortization of transition obligation | (27) | (28) | (27)
Total recognized in other comprehensive income | $ 632 | $ 225 | $ (107)

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + 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 (h)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of transition asset (obligation) recognized in net periodic benefit (cost) credit of defined benefit plan. + 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 (h)(6) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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