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EMPLOYEE BENEFIT PLANS - Costs Recognized Under Defined Contribution Plans and Multiemployer Pension Plans (FY) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Retirement Benefits [Abstract] |  |  |
Multi-employer pension and health & welfare plans | $ 1,522 | $ 2,054 | $ 2,584
401(k) savings and other defined contribution plans | 23,209 | 23,062 | 21,399
Total | $ 24,731 | $ 25,116 | $ 23,983

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- References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Cost recognized for 401(k) savings and other defined contribution plans under Defined Contribution Plans and Multiemployer Pension Plan + References No definition available. + Details
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- Definition Multiemployer Plan, Cost + References No definition available. + Details
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