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FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS - Estimated Fair Values and Related Carrying Values of Financial Instruments (FY) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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4.375% Senior Notes, due 2023 |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Note, carrying value | $ 248,759 | $ 248,567 | $ 248,310
Note, fair value | $ 254,408 | $ 262,033 | 260,265
Stated interest rate (as a percent) | 4.375% | 4.375% |
3.45% Senior Notes |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Note, carrying value | $ 748,225 | $ 747,655 | 747,474
Note, fair value | $ 687,698 | $ 741,113 | 719,273
Stated interest rate (as a percent) | 3.45% | 3.45% |
Interest rate swap agreements |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Derivative, carrying value | $ 87 | $ 1,163 | 3,888
Derivative, fair value | $ 87 | $ 1,163 | $ 3,888

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