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EMPLOYEE BENEFIT PLANS - Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (FY) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($)
United States | Other Postretirement Benefits Plans |
Defined Benefit Plan Disclosure [Line Items] |
Net gain (loss) arising during the year | $ (84)
Effect of exchange rates | 0
Amortization or curtailment recognition of prior service cost | (1,519)
Amortization or settlement recognition of net loss (gain) | 1,225
Total recognized in other comprehensive income (loss) | (378)
Total recognized in net periodic benefit cost and other comprehensive income (loss) | (317)
United States | Defined Benefit Pension Plans |
Defined Benefit Plan Disclosure [Line Items] |
Net gain (loss) arising during the year | 2,477
Effect of exchange rates | 0
Amortization, settlement, or curtailment recognition of net transition obligation | 0
Amortization or curtailment recognition of prior service cost | 3
Amortization or settlement recognition of net loss (gain) | 989
Total recognized in other comprehensive income (loss) | 3,469
Total recognized in net periodic benefit cost and other comprehensive income (loss) | 2,442
Foreign Plan | Other Postretirement Benefits Plans |
Defined Benefit Plan Disclosure [Line Items] |
Net gain (loss) arising during the year | (131)
Effect of exchange rates | 16
Amortization or curtailment recognition of prior service cost | (7)
Amortization or settlement recognition of net loss (gain) | (23)
Total recognized in other comprehensive income (loss) | (145)
Total recognized in net periodic benefit cost and other comprehensive income (loss) | (53)
Foreign Plan | Defined Benefit Pension Plans |
Defined Benefit Plan Disclosure [Line Items] |
Net gain (loss) arising during the year | 3,683
Effect of exchange rates | (4,945)
Amortization, settlement, or curtailment recognition of net transition obligation | 768
Amortization or curtailment recognition of prior service cost | 27
Amortization or settlement recognition of net loss (gain) | 2,846
Total recognized in other comprehensive income (loss) | 2,379
Total recognized in net periodic benefit cost and other comprehensive income (loss) | $ 1,100

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