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Revenue (Tables)
 3 Months Ended
Mar. 28, 2020
Revenue from Contract with Customer [Abstract]  
Summary of Contract Assets and Liabilities The following table presents the beginning and ending balances of contract assets and contract liabilities during the three months ended March 28, 2020:
(In thousands)Contract AssetsContract Liabilities
Beginning Balance, January 1, 2020$19,567  $38,758  
Ending Balance, March 28, 2020
$17,127  $37,750  
Disaggregation of Revenue
The following table presents our revenue disaggregated by Market Segments as follows:
Three Months Ended
(In thousands)March 28, 2020March 30, 2019
Aerospace Segment
Commercial Transport
$102,775  $141,778  
Military
18,11320,953
Business Jet
15,00619,837
Other
5,1765,933
Aerospace Total141,070188,501
Test Systems Segment
Semiconductor
1,6343,354
Aerospace & Defense
14,88016,319
Test Systems Total16,51419,673
Total$157,584  $208,174  
The following table presents our revenue disaggregated by Product Lines as follows:
Three Months Ended
(In thousands)March 28, 2020March 30, 2019
Aerospace Segment
Electrical Power & Motion
$69,456  $92,537  
Lighting & Safety
37,92248,605
Avionics
22,14333,861
Systems Certification
3,3311,618
Structures
3,0425,947
Other
5,1765,933
Aerospace Total141,070188,501
Test Systems16,51419,673
Total$157,584  $208,174