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BENEFIT PLANS (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Pension Benefits [Member] |  |  |  |  |
Net periodic benefit cost [Abstract] |  |  |  |  |
Service cost | $ 1,438 | $ 1,270 |  | $ 2,875 | $ 2,540
Interest cost | 1,356 | 1,565 |  | 2,712 | 3,133
Expected return on plan assets | (3,932) | (3,578) |  | (7,864) | (7,155)
Amortization of unrecognized net loss | 810 | 643 |  | 1,620 | 1,284
Amortization of prior service cost | 60 | 16 |  | 120 | 31
Net periodic benefit | (268) | (84) |  | (537) | (167)
Pension Benefits [Member] | Nonqualified Plan [Member] | Unfunded Plan [Member] |  |  |  |  |
Pension Plans [Abstract] |  |  |  |  |
Contribution made to defined benefit pension plan by employer | 3,900 |  | $ 7,300 |  |
Post-retirement Benefits [Member] |  |  |  |  |
Net periodic benefit cost [Abstract] |  |  |  |  |
Service cost | 0 | 0 |  | 0 | 0
Interest cost | 14 | 18 |  | 28 | 35
Expected return on plan assets | 0 | 0 |  | 0 | 0
Amortization of unrecognized net loss | 10 | 9 |  | 20 | 19
Amortization of prior service cost | (44) | (45) |  | (89) | (89)
Net periodic benefit | $ (20) | $ (18) |  | $ (41) | $ (35)

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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + 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/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -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 (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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