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PENSION AND OTHER POSTRETIREMENT PLANS - Components (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Components of net periodic benefit cost and other amounts recognized in Other Comprehensive Income |  |  |
Total recognized in other comprehensive income | $ 1,076 | $ 1,567 | $ 302
Pension Benefits |  |  |
Components of net periodic benefit cost and other amounts recognized in Other Comprehensive Income |  |  |
Service cost | 952 | 1,106 | 1,129
Interest cost | 908 | 794 | 750
Expected return on plan assets | (2,445) | (2,547) | (2,129)
Amortization of net loss | 494 | 335 | 479
Amortization of prior service credit | (77) | (77) | (77)
Amortization of transition obligation | 0 | 0 | 0
Net periodic benefit (credit) cost | (168) | (389) | 152
Net loss (gain) | (140) | 1,980 | (409)
Amortization of net loss | (494) | (335) | (479)
Amortization of prior service credit | 77 | 77 | 77
Amortization of transition obligation | 0 | 0 | 0
Total recognized in other comprehensive income | (557) | 1,722 | (811)
SERP Benefits |  |  |
Components of net periodic benefit cost and other amounts recognized in Other Comprehensive Income |  |  |
Service cost | 261 | 290 | 212
Interest cost | 147 | 127 | 105
Expected return on plan assets | 0 | 0 | 0
Amortization of net loss | 70 | 121 | 51
Amortization of prior service credit | 0 | 0 | 0
Amortization of transition obligation | 0 | 5 | 27
Net periodic benefit (credit) cost | 478 | 543 | 395
Net loss (gain) | 1,216 | (413) | 710
Amortization of net loss | (70) | (121) | (51)
Amortization of prior service credit | 0 | 0 | 0
Amortization of transition obligation | 0 | (5) | (27)
Total recognized in other comprehensive income | $ 1,146 | $ (539) | $ 632

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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/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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