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Acquisition Activity (Schedule of Acquisition Costs) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
[1]
Sep. 30, 2017
[1]
Jul. 01, 2017
[1]
Apr. 01, 2017
[1]
Dec. 31, 2016
[1]
Oct. 01, 2016
[1]
Jul. 02, 2016
[1]
Apr. 02, 2016
[1]
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]                      
Acquisition costs $ 0 $ 0 $ 0 $ 0 $ 80 $ 0 $ 352 $ 62 $ 0 $ 494 $ 185
Pacific Instruments, Inc.                      
Business Acquisition [Line Items]                      
Acquisition costs                   431  
Stress-Tek, Inc.                      
Business Acquisition [Line Items]                      
Acquisition costs                   63 185
Accounting and Legal Fees | Pacific Instruments, Inc.                      
Business Acquisition [Line Items]                      
Acquisition costs                   369  
Accounting and Legal Fees | Stress-Tek, Inc.                      
Business Acquisition [Line Items]                      
Acquisition costs                   51 70
Appraisal Fees | Pacific Instruments, Inc.                      
Business Acquisition [Line Items]                      
Acquisition costs                   41  
Appraisal Fees | Stress-Tek, Inc.                      
Business Acquisition [Line Items]                      
Acquisition costs                   12 62
Other | Pacific Instruments, Inc.                      
Business Acquisition [Line Items]                      
Acquisition costs                   21  
Other | Stress-Tek, Inc.                      
Business Acquisition [Line Items]                      
Acquisition costs                   $ 0 $ 53
[1] The Company reports interim financial information for the 13-week periods beginning on a Sunday and ending on a Saturday, except for the first fiscal quarter, which always begins on January 1, and the fourth fiscal quarter, which always ends on December 31. The first, second, third, and fourth quarters of 2017 ended on April 1, July 1, September 30, and December 31, respectively. The first, second, third, and fourth quarters of 2016 ended on April 2, July 2, October 1, and December 31, respectively.