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EMPLOYEE BENEFIT PLANS (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) pension_plan | Jun. 30, 2016 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |  |  |  |
Number of qualified defined benefit plans | pension_plan |  |  | 1 |
Weighted-average expected long-term rate of return on plan assets |  |  | 7.20% |
Pension |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 0 | $ 327 | $ 0 | $ 653
Interest cost | 815 | 869 | 1,630 | 1,737
Expected return on plan assets | (945) | (1,008) | (1,891) | (2,015)
Amortization of losses | 116 | 632 | 233 | 1,261
Net periodic benefit (gain) cost | (14) | 820 | (28) | 1,636
Postretirement |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 13 | 2 | 26 | 3
Interest cost | 2 | 12 | 3 | 24
Expected return on plan assets | 0 | 0 | 0 | 0
Amortization of losses | 0 | 0 | 0 | (12)
Net periodic benefit (gain) cost | $ 15 | $ 14 | $ 29 | $ 15

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost 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 (k)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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