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Acquisitions Acquisition Detail (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross		$ 0	$ 157
Goodwill	$ 20,794	20,794	$ 18,804	$ 20,079	$ 19,614
revenue from acquired business	700	1,500
Bolt [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross		5,200
Trade Names [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	500	$ 500
Finite-Lived Intangible Asset, Useful Life		15 years
Customer Relationships [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 2,600	$ 2,600
Finite-Lived Intangible Asset, Useful Life		10 years

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The amount of identifiable intangible assets recognized as of the acquisition date.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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