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INCOME TAXES - Consolidated Provision for Income Taxes (FY) (Details) - USD ($)
$ in Thousands
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
Current taxes              
Federal         $ 86,157 $ 72,317 $ 141,245
State         3,644 9,953 16,072
Foreign         67,395 27,391 24,442
Current taxes         157,196 109,661 181,759
Deferred taxes              
Federal         (22,863) 11,013 9,606
State         (1,024) 1,953 770
Foreign         (43,536) (23,194) (5,395)
Deferred taxes         (67,423) (10,228) 4,981
Total provision $ 16,598 $ 12,746 $ 53,225 $ 64,776 $ 89,773 $ 99,433 $ 186,740