REVENUE (Tables)

12 Months Ended

Dec. 31, 2021

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, 2021	$	17,697	$	28,641
Ending Balance, December 31, 2021	$	25,941	$	28,495

Disaggregation of Revenue

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

(In thousands)	2021		2020		2019
Aerospace Segment
Commercial Transport	$	201,990	$	262,636	$	523,921
Military	70,312		67,944		76,542
Business Jet	56,673		60,437		67,541
Other	36,263		26,971		24,605
Aerospace Total	365,238		417,988		692,609
Test Systems Segment
Semiconductor	—		3,483		9,692
Aerospace & Defense	79,670		81,116		70,401
Test Systems Total	79,670		84,599		80,093
Total	$	444,908	$	502,587	$	772,702

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

(In thousands)	2021		2020		2019
Aerospace Segment
Electrical Power & Motion	$	141,746	$	179,245	$	338,237
Lighting & Safety	103,749		118,928		185,462
Avionics	64,901		76,113		106,787
Systems Certification	13,050		6,899		14,401
Structures	5,529		9,832		23,117
Other	36,263		26,971		24,605
Aerospace Total	365,238		417,988		692,609
Test Systems	79,670		84,599		80,093
Total	$	444,908	$	502,587	$	772,702