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BENEFIT PLANS (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Pension Benefits [Member] |  |  |  |  |
Net periodic benefit cost [Abstract] |  |  |  |  |
Service cost | $ 1,270 |  | $ 1,121 | $ 2,540 | $ 2,242
Interest cost | 1,565 |  | 1,415 | 3,133 | 2,829
Expected return on plan assets | (3,578) |  | (3,705) | (7,155) | (7,410)
Amortization of unrecognized net loss | 643 |  | 298 | 1,284 | 596
Amortization of prior service cost | 16 |  | (83) | 31 | (165)
Net periodic benefit | (84) |  | (954) | (167) | (1,908)
Pension Benefits [Member] | Nonqualified Plan [Member] | Unfunded Plan [Member] |  |  |  |  |
Pension Plans [Abstract] |  |  |  |  |
Unfunded initial projected benefit obligation | 800 |  |  | 800 |
Contribution made to defined benefit pension plan by employer |  | $ 7,300 |  |  |
Post-retirement Benefits [Member] |  |  |  |  |
Net periodic benefit cost [Abstract] |  |  |  |  |
Service cost | 0 |  | 0 | 0 | 0
Interest cost | 18 |  | 17 | 35 | 34
Expected return on plan assets | 0 |  | 0 | 0 | 0
Amortization of unrecognized net loss | 9 |  | 5 | 19 | 10
Amortization of prior service cost | (45) |  | (44) | (89) | (89)
Net periodic benefit | $ (18) |  | $ (22) | $ (35) | $ (45)

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: 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 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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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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