Quarterly report pursuant to Section 13 or 15(d)

Segment Information - Summary of Segment Reporting Information (Details)

v3.7.0.1
Segment Information - Summary of Segment Reporting Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Jul. 01, 2017
Jul. 02, 2016
Dec. 31, 2016
Sales          
Total Consolidated Sales $ 151,114 $ 164,426 $ 303,510 $ 323,956  
Operating Profit and Margins          
Total Operating Profit 11,749 22,611 28,373 40,210  
Deductions from Operating Profit          
Interest Expense, Net of Interest Income 1,180 1,056 2,313 2,143  
Income Before Income Taxes 10,569 21,555 26,060 38,067  
Total Assets 627,828   627,828   $ 604,344
Aerospace          
Sales          
Total Consolidated Sales 129,547 142,501 266,374 280,810  
Test Systems          
Sales          
Total Consolidated Sales 21,567 21,925 37,136 43,146  
Operating Segments          
Operating Profit and Margins          
Total Operating Profit $ 15,416 $ 25,925 $ 35,488 $ 46,826  
Operating margins 10.20% 15.80% 11.70% 14.50%  
Operating Segments | Aerospace          
Sales          
Total Consolidated Sales $ 129,547 $ 142,528 $ 266,374 $ 281,177  
Operating Profit and Margins          
Total Operating Profit $ 13,984 $ 24,851 $ 33,738 $ 43,542  
Operating margins 10.80% 17.40% 12.70% 15.50%  
Deductions from Operating Profit          
Total Assets $ 529,369   $ 529,369   500,892
Operating Segments | Test Systems          
Operating Profit and Margins          
Total Operating Profit $ 1,432 $ 1,074 $ 1,750 $ 3,284  
Operating margins 6.60% 4.90% 4.70% 7.60%  
Deductions from Operating Profit          
Total Assets $ 77,382   $ 77,382   76,575
Intersegment Eliminations | Aerospace          
Sales          
Total Consolidated Sales 0 $ (27) 0 $ (367)  
Corporate Expenses and Other          
Deductions from Operating Profit          
Corporate Expenses and Other 3,667 $ 3,314 7,115 $ 6,616  
Total Assets $ 21,077   $ 21,077   $ 26,877