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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (FY) (Details) - USD ($)
 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
Jun. 05, 2014
Jan. 12, 2012
Summary Of Significant Accounting Policies [Line Items]                  
Allowance for doubtful accounts         $ 12,300,000 $ 7,300,000      
Product warranty expense         50,400,000 28,900,000 $ 35,400,000    
Accrued product warranty $ 154,553,000 $ 148,764,000 $ 154,553,000 $ 148,764,000 153,063,000 138,992,000 92,064,000    
Interest rate swap, accumulated other comprehensive loss         (4,015,000) 2,957,000      
Foreign exchange transaction losses recognized in other (expense) income, net 3,525,000 4,113,000 6,834,000 5,202,000 6,618,000 4,001,000 4,659,000    
Net income attributable to noncontrolling interest (1,670,000) 1,040,000 (3,724,000) (710,000) 29,000 8,517,000 0    
Unbilled accounts receivable 389,277,000   389,277,000   366,168,000 274,912,000      
Customer deposits         369,716,000 256,591,000      
Provisions for loss contracts 66,500,000   66,500,000   94,000,000 60,500,000      
Deferred pre-production costs         20,200,000 29,400,000      
Research and development costs 20,132,000 24,709,000 61,569,000 71,511,000 95,166,000 71,375,000 71,213,000    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Selling, general and administrative expenses 146,839,000 118,183,000 465,197,000 368,788,000 512,552,000 373,559,000 346,086,000    
Interest expense, net 23,713,000 20,038,000 75,917,000 57,460,000 77,884,000 50,298,000 27,254,000    
Other income (expense), net 1,201,000 (443,000) 5,958,000 5,304,000 8,868,000 6,528,000 3,768,000    
Restatement Adjustment | Accounting Standards Update 2017-07                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Selling, general and administrative expenses   300,000   1,000,000 600,000 1,800,000 (1,300,000)    
Interest expense, net   2,200,000   6,500,000 9,200,000 7,700,000 10,400,000    
Other income (expense), net   $ 2,500,000   $ 7,500,000 9,800,000 9,500,000 $ 9,100,000    
Interest rate swap agreements                  
Summary Of Significant Accounting Policies [Line Items]                  
Interest rate swap agreements, notional amount         150,000,000     $ 150,000,000 $ 150,000,000
Interest rate swap agreement, current liability $ 87,000   $ 87,000   $ 1,163,000 $ 3,888,000