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EMPLOYEE BENEFIT PLANS - U.S. and International Pension Plans With Accumulated and Projected Benefit Obligations in Excess of Plan Assets (FY) (Details) - Defined Benefit Pension Plans - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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United States |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation | $ (44,213) | $ (45,512)
Accumulated benefit obligation | (43,340) | (44,530)
Fair value of plan assets | 37,432 | 35,802
Projected benefit obligation | (44,213) | (45,512)
Fair value of plan assets | 37,432 | 35,802
Foreign Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation | (282,077) | (255,682)
Accumulated benefit obligation | (274,557) | (249,729)
Fair value of plan assets | 200,218 | 170,367
Projected benefit obligation | (283,106) | (256,530)
Fair value of plan assets | $ 201,115 | $ 171,133

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- Definition Amount of accumulated benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 + Details
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