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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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