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Long-Term Debt - Schedule of Long-term Debt (Q3) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 14, 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
Revolving Credit Facility
Debt Instrument [Line Items]
Unamortized discount and debt issuance cost	3,412		2,451
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	346,588		853,124	796,150
Unamortized discount and debt issuance cost			2,451	3,850
Other Borrowings
Debt Instrument [Line Items]
Long-term debt	29,721		6,860	1,153
Floating Rate Senior Notes
Debt Instrument [Line Items]
Long-term debt	496,495		0
Floating Rate Senior Notes | Senior Notes
Debt Instrument [Line Items]
Long-term debt	496,495		0
Unamortized discount and debt issuance cost	3,505
Senior Notes due 2024
Debt Instrument [Line Items]
Long-term debt	$ 742,616		0
Stated interest rate (as a percent)	4.15%
Senior Notes due 2024 | Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 742,616		0
Stated interest rate (as a percent)		4.15%
Unamortized discount and debt issuance cost	7,384
Senior Notes due 2028
Debt Instrument [Line Items]
Long-term debt	$ 1,239,417		0
Stated interest rate (as a percent)	4.70%
Senior Notes due 2028 | Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 1,239,417		0
Stated interest rate (as a percent)		4.70%
Unamortized discount and debt issuance cost	10,583
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 discount and 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 discount and debt issuance cost	1,241		$ 1,433	1,690
Schuldschein Loan
Debt Instrument [Line Items]
Long-term debt	$ 11,601		$ 11,998	$ 98,671

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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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