Quarterly report pursuant to Section 13 or 15(d)

Revenue - Disaggregated Revenue by Market (Details)

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Revenue - Disaggregated Revenue by Market (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Disaggregation of Revenue [Line Items]    
Revenues $ 179,059 $ 152,396
Commercial Transport    
Disaggregation of Revenue [Line Items]    
Revenues 133,050 109,723
Military Aircraft    
Disaggregation of Revenue [Line Items]    
Revenues 14,015 15,146
Business Jet    
Disaggregation of Revenue [Line Items]    
Revenues 10,664 7,536
Other    
Disaggregation of Revenue [Line Items]    
Revenues 6,871 4,422
Aerospace    
Disaggregation of Revenue [Line Items]    
Revenues 164,600 136,827
Semiconductor    
Disaggregation of Revenue [Line Items]    
Revenues 7,060 4,631
Aerospace & Defense    
Disaggregation of Revenue [Line Items]    
Revenues 7,399 10,938
Test Systems    
Disaggregation of Revenue [Line Items]    
Revenues $ 14,459 $ 15,569