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INCOME TAXES - Reconciliation of Income Tax Rate (FY) (Details) | 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
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |
U.S. federal statutory rate |  |  |  |  | 35.00% | 35.00% | 35.00%
State taxes |  |  |  |  | 0.40% | 2.10% | 2.00%
Tax reserves |  |  |  |  | 0.00% | (0.20%) | (0.40%)
Foreign |  |  |  |  | (8.30%) | (4.30%) | (2.10%)
Research and development credit |  |  |  |  | (0.80%) | (1.00%) | (0.40%)
Manufacturing deduction |  |  |  |  | (1.10%) | (1.80%) | (2.30%)
France tax rate change |  |  |  |  | (6.50%) | (6.50%) | 0.00%
U.S. tax rate change |  |  |  |  | (7.90%) | 0.00% | 0.00%
U.S. tax reform provision |  |  |  |  | 15.60% | 0.00% | 0.00%
Transaction costs related to acquisitions |  |  |  |  | 0.00% | 1.50% | 0.00%
Other, net |  |  |  |  | (0.90%) | (0.70%) | 0.10%
Effective rate | 16.20% | 15.70% | 17.20% | 23.40% | 25.50% | 24.10% | 31.90%

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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