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PENSION PLANS (Defined Benefit Retirement Plan) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Change in benefit obligation |  |  |  |
Annuity purchase |  | $ 0 | $ 9,390 |
Change in plan assets, at fair value: |  |  |  |
Annuity purchase |  | $ 0 | 9,390 |
Components of net periodic benefit cost |  |  |  |
Settlement |  |  | 3,847 |
Pension Plan |  |  |  |
PENSION PLANS |  |  |  |
Consecutive period of service considered for highest average annual salaries for calculation of benefits under the reactivated plan |  | 60 months |  |
Increase in unrecognized prior service cost due to reactivation of the plan |  | $ 5,900 |  |
Amortization period of increase in prior service cost |  | 13 years |  |
Change in benefit obligation |  |  |  |
Benefit obligation at beginning of year |  | $ 23,677 | 33,067 |
Interest cost |  | 926 | 1,374 | $ 1,383
Actuarial (gains) losses |  | 752 | 1,039 |
Benefits paid |  | (1,884) | (2,413) |
Benefit obligation at end of the year |  | 23,471 | 23,677 | 33,067
Change in plan assets, at fair value: |  |  |  |
Fair value of plan assets at beginning of year |  | 18,539 | 26,321 |
Actual return on plan assets |  | 2,177 | 1,021 |
Employer contributions |  | 4,000 | 3,000 |
Benefits paid |  | (1,884) | (2,413) |
Fair value of plan assets at end of year |  | 22,832 | 18,539 | 26,321
Funded status at end of year |  | (639) | (5,138) |
Amounts recognized in AOCI |  |  |  |
Net actuarial losses |  | $ (8,472) | $ (10,052) |
Benefit obligation actuarial assumptions: |  |  |  |
Weighted average discount rate |  | 3.60% | 4.10% |
Components of net periodic benefit cost |  |  |  |
Interest cost |  | $ 926 | $ 1,374 | 1,383
Expected return on plan assets |  | (1,036) | (1,542) | (1,893)
Amortization of net actuarial losses |  | 1,191 | 1,548 | 1,577
Settlement |  | 0 | 3,847 | 0
Net periodic benefit cost |  | $ 1,081 | $ 5,227 | $ 1,067
Net periodic cost actuarial assumptions |  |  |  |
Weighted average discount rate |  | 4.10% | 4.30% | 4.00%
Expected long-term rate of return on plan assets |  | 5.50% | 6.00% | 7.00%
SERPs |  |  |  |
Change in benefit obligation |  |  |  |
Benefit obligation at beginning of year |  | $ 10,292 | $ 10,651 |
Interest cost |  | 429 | 465 | $ 440
Actuarial (gains) losses |  | 1,708 | (598) |
Benefits paid |  | (1,210) | (226) |
Benefit obligation at end of the year |  | 11,219 | 10,292 | 10,651
Change in plan assets, at fair value: |  |  |  |
Fair value of plan assets at beginning of year |  | 0 | 0 |
Employer contributions |  | 1,209 | 226 |
Benefits paid |  | (1,209) | (226) |
Fair value of plan assets at end of year |  | 0 | 0 | 0
Funded status at end of year |  | (11,219) | (10,292) |
Amounts recognized in AOCI |  |  |  |
Net transition obligation |  | (100) | (112) |
Prior service cost |  | (49) | (66) |
Net actuarial losses |  | (2,163) | (701) |
Total amounts recognized in AOCI |  | $ (2,312) | $ (879) |
Benefit obligation actuarial assumptions: |  |  |  |
Weighted average discount rate |  | 3.50% | 4.10% |
Components of net periodic benefit cost |  |  |  |
Interest cost |  | $ 429 | $ 465 | 440
Amortization of net actuarial (gains) losses |  | 102 | 51 | 111
Amortization of net transition obligation |  | 18 | 17 | 16
Amortization of net actuarial losses |  | 18 | 18 | 18
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement | $ 100 | 138 | 0 | 0
Net periodic benefit cost |  | $ 705 | $ 551 | $ 585
Net periodic cost actuarial assumptions |  |  |  |
Weighted average discount rate |  | 4.10% | 4.40% | 4.10%

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- Definition Represents the consecutive period of service considered for highest average annual salaries for calculation of benefits under the reactivated plan. + References No definition available. + Details
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- Definition Represents the change in unrecognized net prior service costs or credit due to reactivation of the plan. + References No definition available. + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 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)(6) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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