Quarterly report pursuant to Section 13 or 15(d)

Segment Information - Summary of Segment Reporting Information (Details)

v3.8.0.1
Segment Information - Summary of Segment Reporting Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Dec. 31, 2017
Sales      
Total Consolidated Sales $ 179,059 $ 152,396  
Operating Profit (Loss) and Margins      
Total Operating Profit 6,632 16,934  
Deductions from Operating Profit      
Interest Expense, Net of Interest Income 2,331 1,133  
Income Before Income Taxes 3,926 15,491  
Total Assets 767,570   $ 735,956
Aerospace      
Sales      
Total Consolidated Sales 164,600    
Test Systems      
Sales      
Total Consolidated Sales 14,459    
Operating Segments      
Operating Profit (Loss) and Margins      
Total Operating Profit $ 11,186 $ 20,072  
Operating margins, percentage 6.20% 13.20%  
Operating Segments | Aerospace      
Sales      
Total Consolidated Sales $ 164,600 $ 136,827  
Operating Profit (Loss) and Margins      
Total Operating Profit $ 13,115 $ 19,754  
Operating margins, percentage 8.00% 14.40%  
Deductions from Operating Profit      
Total Assets $ 628,129   621,047
Operating Segments | Test Systems      
Sales      
Total Consolidated Sales 14,459 $ 15,569  
Operating Profit (Loss) and Margins      
Total Operating Profit $ (1,929) $ 318  
Operating margins, percentage (13.30%) 2.00%  
Deductions from Operating Profit      
Total Assets $ 113,467   90,859
Corporate Expenses and Other      
Deductions from Operating Profit      
Corporate Expenses and Other 4,929 $ 3,448  
Total Assets $ 25,974   $ 24,050