Annual report pursuant to Section 13 and 15(d)

Revenue - Revenue Disaggregated by Market (Details)

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Revenue - Revenue Disaggregated by Market (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 28, 2019
Jun. 29, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 29, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]                      
Sales $ 198,412 $ 177,018 $ 189,098 $ 208,174 $ 202,917 $ 212,674 $ 208,606 $ 179,059 $ 772,702 $ 803,256 $ 624,464
Commercial Transport                      
Disaggregation of Revenue [Line Items]                      
Sales                 523,921 536,269 414,523
Military                      
Disaggregation of Revenue [Line Items]                      
Sales                 76,542 68,138 61,270
Business Jet                      
Disaggregation of Revenue [Line Items]                      
Sales                 67,541 43,090 41,298
Other                      
Disaggregation of Revenue [Line Items]                      
Sales                 24,605 28,128 17,512
Aerospace                      
Disaggregation of Revenue [Line Items]                      
Sales                 692,609 675,625 534,603
Semiconductor                      
Disaggregation of Revenue [Line Items]                      
Sales                 9,692 84,254 31,999
Aerospace & Defense                      
Disaggregation of Revenue [Line Items]                      
Sales                 70,401 43,377 57,862
Test Systems                      
Disaggregation of Revenue [Line Items]                      
Sales                 $ 80,093 $ 127,631 $ 89,861