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Acquisitions - 2019 Acquisitions (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 29, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Percentage of interests acquired	70.00%
Payments to acquire businesses	$ 46,300
Goodwill	$ 5,434,000		$ 5,378,388
Intangible assets acquired		$ 18,400
The Additive Advantage, LLC [Member]
Business Acquisition [Line Items]
Goodwill, expected tax deductible amount		$ 55,400
Minimum
Business Acquisition [Line Items]
Percentage of interests acquired	49.00%
Maximum
Business Acquisition [Line Items]
Percentage of interests acquired	60.00%

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

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-Publisher FASB
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The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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Amount of intangible assets, excluding goodwill, 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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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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