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Acquisitions Acquisitions (Assets Acquired) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Aug. 28, 2018	Aug. 21, 2018	Jul. 10, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill Recorded	$ 304,733	$ 16,777			$ 287,956	$ 275,487
Liabilities and Debt Assumed		(399)
Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Assets Acquired (Excluding Goodwill)		5,900	$ 2,500	$ 13,200
Goodwill Recorded		300	500	16,000
Liabilities and Debt Assumed		$ (200)	$ (200)	$ 0

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Amount of assets acquired at the acquisition date.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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