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EMPLOYEE BENEFIT PLANS - Obligations and Funded Status (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
Dec. 31, 2017
Dec. 31, 2016
Amounts recognized in the statement of financial position consist of:                  
Noncurrent liabilities $ (95,310)   $ (95,310)         $ (103,734) $ (110,597)
United States | Defined Benefit Pension Plans                  
Change in projected benefit obligation                  
Obligation at beginning of year     (44,213) $ (45,512) $ (45,512) $ (46,120)      
Opening balance sheet adjustment         0 0      
Service cost (87) $ (86) (261) (258) (344) (337) $ (381)    
Interest cost (333) (356) (999) (1,068) (1,422) (1,475) (1,914)    
Employee contributions         0 0      
Plan curtailments and amendments         0 0      
Benefits paid         3,079 3,893      
Acquisition         0 0      
Actuarial gain (loss)         (14) (1,473)      
Effect of currency rate changes         0 0      
Obligation at end of year         (44,213) (45,512) (46,120)    
Change in plan assets                  
Fair value of plan assets at beginning of year     37,432 35,802 35,802 37,640      
Opening balance sheet adjustment         0 0      
Actual return on plan assets         4,223 2,055      
Employer contributions         486 0      
Employee contributions         0 0      
Benefits paid         (3,079) (3,893)      
Acquisition         0 0      
Effect of currency rate changes         0 0      
Fair value of plan assets at end of year         37,432 35,802 37,640    
Benefit obligations     (44,213) (45,512) (45,512) (45,512) (46,120) (44,213) (45,512)
Funded status               (6,781) (9,710)
Amounts recognized in the statement of financial position consist of:                  
Noncurrent assets               0 0
Current liabilities               0 0
Noncurrent liabilities               (6,781) (9,710)
Net amount recognized               (6,781) (9,710)
Amounts recognized in accumulated other comprehensive income (loss) consist of:                  
Prior service cost               (6) (8)
Net actuarial (loss) gain               (20,418) (23,884)
Net amount recognized               (20,424) (23,892)
United States | Other Postretirement Benefits Plans                  
Change in projected benefit obligation                  
Obligation at beginning of year     (11,345) (11,876) (11,876) (12,959)      
Service cost (1) (1) (3) (3) (5) (4) (9)    
Interest cost (81) (88) (243) (264) (350) (389) (1,233)    
Plan amendments         0 6      
Benefits paid         970 720      
Acquisition         0 (143)      
Actuarial gain (loss)         (84) 893      
Effect of currency rate changes         0 0      
Obligation at end of year         (11,345) (11,876) (12,959)    
Change in plan assets                  
Fair value of plan assets at beginning of year     0 0 0 0      
Employer contributions         970 720      
Benefits paid         (970) (720)      
Fair value of plan assets at end of year         0 0 0    
Benefit obligations     (11,345) (11,876) (11,876) (11,876) (12,959) (11,345) (11,876)
Funded status               (11,345) (11,876)
Amounts recognized in the statement of financial position consist of:                  
Current liabilities               (1,046) (1,084)
Noncurrent liabilities               (10,299) (10,792)
Net amount recognized               (11,345) (11,876)
Amounts recognized in accumulated other comprehensive income (loss) consist of:                  
Prior service cost               19,616 21,134
Net actuarial (loss) gain               (18,882) (20,023)
Net amount recognized               734 1,111
Foreign Plan | Defined Benefit Pension Plans                  
Change in projected benefit obligation                  
Obligation at beginning of year     (353,017) (319,551) (319,551) (195,311)      
Opening balance sheet adjustment         (5,321) 0      
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)    
Employee contributions         (880) (195)      
Plan curtailments and amendments         4,153 2,061      
Benefits paid         12,906 9,427      
Acquisition         0 (114,242)      
Actuarial gain (loss)         (3,009) (33,330)      
Effect of currency rate changes         (31,265) 19,192      
Obligation at end of year         (353,017) (319,551) (195,311)    
Change in plan assets                  
Fair value of plan assets at beginning of year     281,602 241,283 241,283 168,069      
Opening balance sheet adjustment         2,058 0      
Actual return on plan assets         19,102 20,066      
Employer contributions         13,479 6,933      
Employee contributions         880 195      
Benefits paid         (12,905) (9,427)      
Acquisition         0 70,519      
Settlements         (4,523)        
Effect of currency rate changes         22,228 (15,072)      
Fair value of plan assets at end of year         281,602 241,283 168,069    
Benefit obligations     (353,017) (319,551) (319,551) (319,551) (195,311) (353,017) (319,551)
Funded status               (71,415) (78,268)
Amounts recognized in the statement of financial position consist of:                  
Noncurrent assets               10,577 7,130
Current liabilities               (2,158) (2,042)
Noncurrent liabilities               (79,834) (83,356)
Net amount recognized               (71,415) (78,268)
Amounts recognized in accumulated other comprehensive income (loss) consist of:                  
Prior service cost               (32) (56)
Net actuarial (loss) gain               (54,043) (56,411)
Net amount recognized               (54,075) (56,467)
Foreign Plan | Other Postretirement Benefits Plans                  
Change in projected benefit obligation                  
Obligation at beginning of year     (3,720) (3,425) (3,425) (3,290)      
Service cost (8) (7) (24) (21) (28) (29) (38)    
Interest cost $ (26) $ (24) (78) (72) (98) (99) (128)    
Plan amendments         0 0      
Benefits paid         199 133      
Acquisition         0 0      
Actuarial gain (loss)         (131) (42)      
Effect of currency rate changes         (237) (98)      
Obligation at end of year         (3,720) (3,425) (3,290)    
Change in plan assets                  
Fair value of plan assets at beginning of year     0 0 0 0      
Employer contributions         199 133      
Benefits paid         (199) (133)      
Fair value of plan assets at end of year         0 0 0    
Benefit obligations     $ (3,720) $ (3,425) $ (3,425) $ (3,425) $ (3,290) (3,720) (3,425)
Funded status               (3,720) (3,425)
Amounts recognized in the statement of financial position consist of:                  
Current liabilities               (208) (185)
Noncurrent liabilities               (3,512) (3,160)
Net amount recognized               (3,720) (3,345)
Amounts recognized in accumulated other comprehensive income (loss) consist of:                  
Prior service cost               9 15
Net actuarial (loss) gain               154 292
Net amount recognized               $ 163 $ 307