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EMPLOYEE BENEFIT PLANS - Weighted-Average Assumptions (Details) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
ACCUMULATED BENEFIT OBLIGATION |  |  |
Discount rate | 4.00% | 4.45% | 4.70%
NET BENEFIT COST |  |  |
Discount rate | 4.45% | 4.70% | 4.15%
Expected return on plan assets | 7.00% | 7.00% | 7.00%

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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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