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Fair Value Measurement and Fair Value of Financial Instruments - Estimated Fair Values and Related Carrying Values of Financial Instruments (Q3) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest rate swap agreements
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative, carrying value	$ 87	$ 1,163	$ 3,888
Fair value	87	1,163	3,888
4.375% Senior Notes, due 2023
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carry value	248,759	248,567	248,310
Fair value	$ 254,408	$ 262,033	260,265
Stated interest rate (as a percent)	4.375%	4.375%
3.45% Senior Notes
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carry value	$ 748,225	$ 747,655	747,474
Fair value	$ 687,698	$ 741,113	$ 719,273
Stated interest rate (as a percent)	3.45%	3.45%
Floating Rate Senior Notes
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carry value	$ 496,495	$ 0
Fair value	501,065	0
Senior Notes due 2024
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carry value	742,616	0
Fair value	$ 745,350	0
Stated interest rate (as a percent)	4.15%
Senior Notes due 2028
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carry value	$ 1,239,417	0
Fair value	$ 1,232,300	$ 0
Stated interest rate (as a percent)	4.70%

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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+ References

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No definition available.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Fair value portion of notes payable.

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