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Revenue (Tables)
 9 Months Ended
Sep. 26, 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 nine months ended September 26, 2020:
(In thousands)Contract AssetsContract Liabilities
Beginning Balance, January 1, 2020$19,567 $38,758 
Ending Balance, September 26, 2020
$19,460 $29,392 
Disaggregation of Revenue
The following table presents our revenue disaggregated by Market Segments as follows:
Nine Months EndedThree Months Ended
(In thousands)September 26, 2020September 28, 2019September 26, 2020September 28, 2019
Aerospace Segment
Commercial Transport
$214,390 $393,721 $44,067 $122,212 
Military
50,329 57,753 18,164 17,255 
Business Jet
45,259 49,555 14,711 12,432 
Other
16,213 19,461 5,606 5,803 
Aerospace Total326,191 520,490 82,548 157,702 
Test Systems Segment
Semiconductor
3,407 7,815 585 2,219 
Aerospace & Defense
58,186 45,985 23,373 17,097 
Test Systems Total61,593 53,800 23,958 19,316 
Total$387,784 $574,290 $106,506 $177,018 
The following table presents our revenue disaggregated by Product Lines as follows:
Nine Months EndedThree Months Ended
(In thousands)September 26, 2020September 28, 2019September 26, 2020September 28, 2019
Aerospace Segment
Electrical Power & Motion
$148,500 $255,007 $32,481 $78,428 
Lighting & Safety
90,973 139,502 25,320 44,127 
Avionics
57,381 79,414 16,104 19,871 
Systems Certification
5,596 9,050 605 3,384 
Structures
7,528 18,056 2,432 6,089 
Other
16,213 19,461 5,606 5,803 
Aerospace Total326,191 520,490 82,548 157,702 
Test Systems61,593 53,800 23,958 19,316 
Total$387,784 $574,290 $106,506 $177,018