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Acquisition Activity (Narrative) (Details) - USD ($) $ in Thousands			12 Months Ended
	Apr. 06, 2016	Dec. 30, 2015	Dec. 31, 2018
Pacific Instruments, Inc.
Business Acquisition [Line Items]
Purchase price	$ 10,626
Pacific Instruments, Inc. | Patents and Acquired Technology
Business Acquisition [Line Items]
Finite-lived intangible assets, weighted average useful lives			20 years
Pacific Instruments, Inc. | Non-competition agreements
Business Acquisition [Line Items]
Finite-lived intangible assets, weighted average useful lives			6 years 6 months
Pacific Instruments, Inc. | Customer relationships
Business Acquisition [Line Items]
Finite-lived intangible assets, weighted average useful lives			15 years
Stress-Tek, Inc.
Business Acquisition [Line Items]
Purchase price		$ 20,073
Stress-Tek, Inc. | Patents and Acquired Technology
Business Acquisition [Line Items]
Finite-lived intangible assets, weighted average useful lives			20 years
Stress-Tek, Inc. | Non-competition agreements
Business Acquisition [Line Items]
Finite-lived intangible assets, weighted average useful lives			5 years
Stress-Tek, Inc. | Customer relationships
Business Acquisition [Line Items]
Finite-lived intangible assets, weighted average useful lives			15 years

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