RESTRUCTURING COSTS - Schedule of Restructuring Accrual (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 6,944	$ 0
Increase (Decrease) in Restructuring Reserve	27,128
Payments for Restructuring	(20,184)
Commercial/Industrial
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	2,756	0
Increase (Decrease) in Restructuring Reserve	16,609
Payments for Restructuring	(13,853)
Defense
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	213	0
Increase (Decrease) in Restructuring Reserve	3,190
Payments for Restructuring	(2,977)
Power
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	3,975	0
Increase (Decrease) in Restructuring Reserve	7,329
Payments for Restructuring	(3,354)
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	6,333	0
Increase (Decrease) in Restructuring Reserve	21,197
Payments for Restructuring	(14,864)
Employee Severance [Member] \| Commercial/Industrial
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	2,279	0
Increase (Decrease) in Restructuring Reserve	12,075
Payments for Restructuring	(9,796)
Employee Severance [Member] \| Defense
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	213	0
Increase (Decrease) in Restructuring Reserve	3,150
Payments for Restructuring	(2,937)
Employee Severance [Member] \| Power
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	3,841	0
Increase (Decrease) in Restructuring Reserve	5,972
Payments for Restructuring	(2,131)
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	611	0
Increase (Decrease) in Restructuring Reserve	5,931
Payments for Restructuring	(5,320)
Facility Closing [Member] \| Commercial/Industrial
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	477	0
Increase (Decrease) in Restructuring Reserve	4,534
Payments for Restructuring	(4,057)
Facility Closing [Member] \| Defense
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0	0
Increase (Decrease) in Restructuring Reserve	40
Payments for Restructuring	(40)
Facility Closing [Member] \| Power
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	134	$ 0
Increase (Decrease) in Restructuring Reserve	1,357
Payments for Restructuring	$ (1,223)

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.

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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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