Quarterly report pursuant to Section 13 or 15(d)

Segment Information - Summary of Segment Reporting Information (Details)

v3.10.0.1
Segment Information - Summary of Segment Reporting Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Dec. 31, 2017
Segment Reporting Information          
Sales $ 212,674 $ 149,636 $ 600,339 $ 453,146  
Operating Profit and Margins          
Total Operating Profit 18,344 10,394 45,105 39,387  
Deductions from Operating Profit          
Interest Expense, Net of Interest Income 2,511 1,437 7,326 3,750  
Income Before Income Taxes 15,580 8,646 36,688 34,706  
Total Assets 776,056   776,056   $ 735,956
Aerospace Segment          
Segment Reporting Information          
Sales 169,579 128,663 500,383 395,037  
Test Systems Segment          
Segment Reporting Information          
Sales 43,095 20,973 99,956 58,109  
Operating Segments          
Operating Profit and Margins          
Total Operating Profit $ 22,043 $ 14,108 $ 57,676 $ 49,596  
Operating margins, percentage 10.40% 9.40% 9.60% 10.90%  
Operating Segments | Aerospace Segment          
Segment Reporting Information          
Sales $ 169,588 $ 128,663 $ 500,445 $ 395,037  
Operating Profit and Margins          
Total Operating Profit $ 16,210 $ 13,015 $ 47,525 $ 46,753  
Operating margins, percentage 9.60% 10.10% 9.50% 11.80%  
Deductions from Operating Profit          
Total Assets $ 639,826   $ 639,826   621,047
Operating Segments | Test Systems Segment          
Segment Reporting Information          
Sales 43,095 $ 20,973 99,956 $ 58,109  
Operating Profit and Margins          
Total Operating Profit $ 5,833 $ 1,093 $ 10,151 $ 2,843  
Operating margins, percentage 13.50% 5.20% 10.20% 4.90%  
Deductions from Operating Profit          
Total Assets $ 112,455   $ 112,455   90,859
Less Intersegment Sales | Aerospace Segment          
Segment Reporting Information          
Sales (9) $ 0 (62) $ 0  
Corporate Expenses and Other          
Deductions from Operating Profit          
Corporate Expenses and Other 3,952 $ 4,025 13,662 $ 11,140  
Total Assets $ 23,775   $ 23,775   $ 24,050