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 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Dec. 31, 2016
Sales          
Total Consolidated Sales $ 149,636 $ 155,099 $ 453,146 $ 479,055  
Operating Profit and Margins          
Total Operating Profit 10,083 17,525 38,456 57,735  
Deductions from Operating Profit          
Interest Expense, Net of Interest Income 1,437 1,103 3,750 3,246  
Income Before Income Taxes 8,646 16,422 34,706 54,489  
Total Assets 640,628   640,628   $ 604,344
Aerospace          
Sales          
Total Consolidated Sales 128,663 125,179 395,037 405,989  
Test Systems          
Sales          
Total Consolidated Sales 20,973 29,920 58,109 73,066  
Operating Segments          
Operating Profit and Margins          
Total Operating Profit $ 14,108 $ 20,797 $ 49,596 $ 67,623  
Operating margins, percentage 9.40% 13.40% 10.90% 14.10%  
Operating Segments | Aerospace          
Sales          
Total Consolidated Sales $ 128,663 $ 125,179 $ 395,037 $ 406,356  
Operating Profit and Margins          
Total Operating Profit $ 13,015 $ 17,557 $ 46,753 $ 61,099  
Operating margins, percentage 10.10% 14.00% 11.80% 15.00%  
Deductions from Operating Profit          
Total Assets $ 523,563   $ 523,563   500,892
Operating Segments | Test Systems          
Operating Profit and Margins          
Total Operating Profit $ 1,093 $ 3,240 $ 2,843 $ 6,524  
Operating margins, percentage 5.20% 10.80% 4.90% 8.90%  
Deductions from Operating Profit          
Total Assets $ 85,848   $ 85,848   76,575
Intersegment Eliminations | Aerospace          
Sales          
Total Consolidated Sales 0 $ 0 0 $ (367)  
Corporate Expenses and Other          
Deductions from Operating Profit          
Corporate Expenses and Other 4,025 $ 3,272 11,140 $ 9,888  
Total Assets $ 31,217   $ 31,217   $ 26,877