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 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Disaggregation of Revenue [Line Items]        
Revenues $ 208,606 $ 151,114 $ 387,665 $ 303,510
Commercial Transport        
Disaggregation of Revenue [Line Items]        
Revenues 132,797 98,355 265,847 208,079
Military Aircraft        
Disaggregation of Revenue [Line Items]        
Revenues 16,270 15,785 30,285 30,931
Business Jet        
Disaggregation of Revenue [Line Items]        
Revenues 10,338 10,716 21,002 18,251
Other        
Disaggregation of Revenue [Line Items]        
Revenues 6,799 4,691 13,670 9,113
Aerospace        
Disaggregation of Revenue [Line Items]        
Revenues 166,204 129,547 330,804 266,374
Semiconductor        
Disaggregation of Revenue [Line Items]        
Revenues 31,405 7,080 38,465 11,711
Aerospace & Defense        
Disaggregation of Revenue [Line Items]        
Revenues 10,997 14,487 18,396 25,425
Test Systems        
Disaggregation of Revenue [Line Items]        
Revenues $ 42,402 $ 21,567 $ 56,861 $ 37,136