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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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