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 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Dec. 31, 2017
Segment Reporting Information          
Revenues $ 208,606 $ 151,114 $ 387,665 $ 303,510  
Operating Profit and Margins          
Total Operating Profit 20,129 12,059 26,761 28,993  
Deductions from Operating Profit          
Interest Expense, Net of Interest Income 2,484 1,180 4,815 2,313  
Income Before Income Taxes 17,182 10,569 21,108 26,060  
Total Assets 764,423   764,423   $ 735,956
Aerospace          
Segment Reporting Information          
Revenues 166,204 129,547 330,804 266,374  
Test Systems          
Segment Reporting Information          
Revenues 42,402 21,567 56,861 37,136  
Operating Segments          
Operating Profit and Margins          
Total Operating Profit $ 24,447 $ 15,416 $ 35,633 $ 35,488  
Operating margins, percentage 11.70% 10.20% 9.20% 11.70%  
Operating Segments | Aerospace          
Segment Reporting Information          
Revenues $ 166,257 $ 129,547 $ 330,857 $ 266,374  
Operating Profit and Margins          
Total Operating Profit $ 18,200 $ 13,984 $ 31,315 $ 33,738  
Operating margins, percentage 11.00% 10.80% 9.50% 12.70%  
Deductions from Operating Profit          
Total Assets $ 632,365   $ 632,365   621,047
Operating Segments | Test Systems          
Segment Reporting Information          
Revenues 42,402 $ 21,567 56,861 $ 37,136  
Operating Profit and Margins          
Total Operating Profit $ 6,247 $ 1,432 $ 4,318 $ 1,750  
Operating margins, percentage 14.70% 6.60% 7.60% 4.70%  
Deductions from Operating Profit          
Total Assets $ 110,903   $ 110,903   90,859
Less Intersegment Sales | Aerospace          
Segment Reporting Information          
Revenues (53) $ 0 (53) $ 0  
Corporate Expenses and Other          
Deductions from Operating Profit          
Corporate Expenses and Other 4,781 $ 3,667 9,710 $ 7,115  
Total Assets $ 21,155   $ 21,155   $ 24,050