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LONG-TERM DEBT - Principal Repayments of Debt and Capital Lease (FY) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]      
2018   $ 47,225  
2019   330,901  
2020   559  
2021   483,379  
2022   208  
Future years   1,008,256  
Total $ 3,865,099 $ 1,870,528 $ 1,892,776