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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 |  |  |

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- Definition The current portion of money or property received from customers which is either to be returned upon satisfactory contract completion or applied to customer receivables in accordance with the terms of the contract or the understandings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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