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EMPLOYEE BENEFIT PLANS - Components of Net Periodic Benefit Costs (FY) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
United States | Defined Benefit Pension Plans |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Service cost | $ 87 | $ 86 | $ 261 | $ 258 | $ 344 | $ 337 | $ 381
Interest cost | 333 | 356 | 999 | 1,068 | 1,422 | 1,475 | 1,914
Expected return on plan assets | (445) | (433) | (1,335) | (1,299) | (1,731) | (2,076) | (2,168)
Amortization of initial net obligation and prior service cost |  |  |  |  | 3 | 3 | 3
Amortization of net loss | 243 | 248 | 729 | 744 | 989 | 914 | 1,062
Settlement and curtailment losses recognized |  |  |  |  | 0 | 0 | 0
Net periodic benefit cost (credit) | 218 | 257 | 654 | 771 | 1,027 | 653 | 1,192
United States | Other Postretirement Benefits Plans |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Service cost | 1 | 1 | 3 | 3 | 5 | 4 | 9
Interest cost | 81 | 88 | 243 | 264 | 350 | 389 | 1,233
Amortization of initial net obligation and prior service cost |  |  |  |  | (1,519) | (1,709) | (2,295)
Amortization of net loss | (76) | (73) | (228) | (219) | 1,225 | 1,287 | 1,356
Net periodic benefit cost (credit) | 6 | 16 | 18 | 48 | 61 | (29) | 303
Foreign Plan | Defined Benefit Pension Plans |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Service cost | 691 | 614 | 2,073 | 1,842 | 2,740 | 1,379 | 2,015
Interest cost | 1,834 | 1,677 | 5,502 | 5,031 | 7,310 | 5,774 | 7,091
Expected return on plan assets | (3,466) | (2,910) | (10,398) | (8,730) | (12,412) | (9,971) | (9,591)
Amortization of initial net obligation and prior service cost |  |  |  |  | 27 | 61 | 212
Amortization of net loss | 554 | 685 | 1,662 | 2,055 | 2,846 | 1,818 | 2,379
Settlement and curtailment losses recognized |  |  |  |  | 768 | 218 | 0
Net periodic benefit cost (credit) | (387) | 66 | (1,161) | 198 | 1,279 | (721) | 2,106
Foreign Plan | Other Postretirement Benefits Plans |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Service cost | 8 | 7 | 24 | 21 | 28 | 29 | 38
Interest cost | 26 | 24 | 78 | 72 | 98 | 99 | 128
Amortization of initial net obligation and prior service cost |  |  |  |  | (7) | (7) | (7)
Amortization of net loss | (4) | (7) | (12) | (21) | (23) | (29) | (30)
Net periodic benefit cost (credit) | $ 30 | $ 24 | $ 90 | $ 72 | $ 96 | $ 92 | $ 129

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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 Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets 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)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from settlement and curtailment. + 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)(7) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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