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REVENUE (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045 + Details
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