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LONG-TERM DEBT - Schedule of Long-Term Debt (FY) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2016	Nov. 03, 2016	Oct. 31, 2016	Aug. 31, 2013
Debt Instrument [Line Items]
Capital Leases	$ 1,677	$ 2,324	$ 1,018
Total	3,865,099	1,870,528	1,892,776
Less - current portion	47,038	47,225	129,809
Long-term portion	3,818,061	1,823,303	1,762,967
Other Debt Obligations
Debt Instrument [Line Items]
Long-term debt	29,721	6,860	1,153
Revolving Credit Facility
Debt Instrument [Line Items]
Unamortized debt issuance cost	3,412	2,451
Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Long-term debt	346,588	853,124	796,150
Unamortized debt issuance cost		2,451	3,850
Senior Notes Due 2026
Debt Instrument [Line Items]
Long-term debt	$ 748,225	$ 747,655	747,474
Stated interest rate (as a percent)	3.45%	3.45%
Senior Notes Due 2026 | Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 748,225	$ 747,655	747,474
Stated interest rate (as a percent)		3.45%		3.45%	3.45%
Unamortized debt issuance cost	1,775	$ 2,345	2,526
4.375% Senior Notes, due 2023
Debt Instrument [Line Items]
Long-term debt	$ 248,759	$ 248,567	248,310
Stated interest rate (as a percent)	4.375%	4.375%
4.375% Senior Notes, due 2023 | Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 248,759	$ 248,567	248,310
Stated interest rate (as a percent)		4.375%				4.375%
Unamortized debt issuance cost	1,241	$ 1,433	1,690
Schuldschein Loan
Debt Instrument [Line Items]
Long-term debt	$ 11,601	$ 11,998	$ 98,671

X

- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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