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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