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Acquisition Activity (Schedule of Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands | Apr. 06, 2016 | Dec. 30, 2015 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | ---
Intangible assets: |  |  |  |  |  |
Goodwill |  |  |  | $ 16,141 | $ 19,181 | $ 18,717
Pacific Instruments, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Working capital | [1] | $ 921 |  |  |  |
Property and equipment |  | 26 |  |  |  |
Long-term deferred income tax liability |  | (1,903) |  |  |  |
Intangible assets: |  |  |  |  |  |
Total intangible assets |  | 5,540 |  |  |  |
Fair value of acquired identifiable assets and liabilities |  | 4,584 |  |  |  |
Purchase price |  | 10,626 |  |  |  |
Goodwill |  | 6,042 |  |  |  |
Pacific Instruments, Inc. | Trade names |  |  |  |  |  |
Intangible assets: |  |  |  |  |  |
Total intangible assets |  | 700 |  |  |  |
Pacific Instruments, Inc. | Patents and Acquired Technology |  |  |  |  |  |
Intangible assets: |  |  |  |  |  |
Total intangible assets |  | 1,300 |  |  |  |
Pacific Instruments, Inc. | Non-competition agreements |  |  |  |  |  |
Intangible assets: |  |  |  |  |  |
Total intangible assets |  | 40 |  |  |  |
Pacific Instruments, Inc. | Customer relationships |  |  |  |  |  |
Intangible assets: |  |  |  |  |  |
Total intangible assets |  | $ 3,500 |  |  |  |
Stress-Tek, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Working capital |  |  | $ 2,564 |  |  |
Property and equipment |  |  | 6,338 |  |  |
Intangible assets: |  |  |  |  |  |
Total intangible assets |  |  | 4,860 |  |  |
Fair value of acquired identifiable assets and liabilities |  |  | 13,762 |  |  |
Purchase price |  |  | 20,073 |  |  |
Goodwill |  |  | 6,311 |  |  |
Stress-Tek, Inc. | Trade names |  |  |  |  |  |
Intangible assets: |  |  |  |  |  |
Total intangible assets |  |  | 700 |  |  |
Stress-Tek, Inc. | Patents and Acquired Technology |  |  |  |  |  |
Intangible assets: |  |  |  |  |  |
Total intangible assets |  |  | 1,600 |  |  |
Stress-Tek, Inc. | Non-competition agreements |  |  |  |  |  |
Intangible assets: |  |  |  |  |  |
Total intangible assets |  |  | 60 |  |  |
Stress-Tek, Inc. | Customer relationships |  |  |  |  |  |
Intangible assets: |  |  |  |  |  |
Total intangible assets |  |  | $ 2,500 |  |  |
[1] | (a)Working capital accounts include accounts receivable, inventory, prepaid expenses and other current assets, trade accounts payable, accrued payroll, income taxes payable, and other accrued expenses.

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