Revenue (Tables)

12 Months Ended

Dec. 31, 2019

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:

(In thousands)	Contract Assets		Contract Liabilities
Beginning Balance, January 1, 2019	$	33,030	$	27,347
Ending Balance, December 31, 2019	$	19,567	$	38,758

Disaggregation of Revenue

The following table presents our revenue disaggregated by Market Segments as of December 31 as follows:

(In thousands)	2019		2018		2017
Aerospace Segment
Commercial Transport	$	523,921	$	536,269	$	414,523
Military	76,542		68,138		61,270
Business Jet	67,541		43,090		41,298
Other	24,605		28,128		17,512
Aerospace Total	692,609		675,625		534,603
Test Systems Segment
Semiconductor	9,692		84,254		31,999
Aerospace & Defense	70,401		43,377		57,862
Test Systems Total	80,093		127,631		89,861
Total	$	772,702	$	803,256	$	624,464

The following table presents our revenue disaggregated by Product Lines as of December 31 as follows:

(In thousands)	2019		2018		2017
Aerospace Segment
Electrical Power & Motion	$	338,237	$	303,180	$	264,286
Lighting & Safety	185,462		174,383		158,663
Avionics	106,787		131,849		53,960
Systems Certification	14,401		13,951		14,333
Structures	23,117		24,134		25,849
Other	24,605		28,128		17,512
Aerospace Total	692,609		675,625		534,603
Test Systems	80,093		127,631		89,861
Total	$	772,702	$	803,256	$	624,464