RESTRUCTURING COSTS - Schedule of Restructuring Accrual (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2020	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 7,615	$ 0
Increase (Decrease) in Restructuring Reserve	18,291
Payments for Restructuring	10,676
Commercial Industrial [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	5,438	0
Increase (Decrease) in Restructuring Reserve	11,524
Payments for Restructuring	6,086
Defense [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	439	0
Increase (Decrease) in Restructuring Reserve	3,056
Payments for Restructuring	2,617
Power [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	1,738	0
Increase (Decrease) in Restructuring Reserve	3,711
Payments for Restructuring	1,973
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	7,266	0
Increase (Decrease) in Restructuring Reserve	15,044
Payments for Restructuring	7,778
Employee Severance [Member] \| Commercial Industrial [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	5,089	0
Increase (Decrease) in Restructuring Reserve	9,028
Payments for Restructuring	3,939
Employee Severance [Member] \| Defense [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	439	0
Increase (Decrease) in Restructuring Reserve	3,015
Payments for Restructuring	2,576
Employee Severance [Member] \| Power [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	1,738	0
Increase (Decrease) in Restructuring Reserve	3,001
Payments for Restructuring	1,263
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	349	0
Increase (Decrease) in Restructuring Reserve	3,247
Payments for Restructuring	2,898
Facility Closing [Member] \| Commercial Industrial [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	349	0
Increase (Decrease) in Restructuring Reserve	2,496
Payments for Restructuring	2,147
Facility Closing [Member] \| Defense [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0	0
Increase (Decrease) in Restructuring Reserve	41
Payments for Restructuring	41
Facility Closing [Member] \| Power [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0	$ 0
Increase (Decrease) in Restructuring Reserve	710
Payments for Restructuring	$ 710

The increase (decrease) during the period in the carrying amount (including both current and noncurrent portions of the accrual) of the liability pertaining to the exit from or disposal of business activities or restructuring pursuant to a duly authorized plan, excluding costs or losses pertaining to an entity newly acquired in a business combination and to asset retirement obligations.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

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- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 17
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3367-108585

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

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