Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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ACQUISITIONS (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		12 Months Ended
ACQUISITIONS (Narrative) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Business Acquisition
Goodwill	$ 327,100	$ 329,630			$ 327,100		$ 329,630
Business Combination, Acquisition Related Costs	$ 0			$ 800	$ 200	$ 900
B&R Industries, Inc.
Business Acquisition
Business acquisition, percentage of voting interests acquired		100.00%					100.00%
Total purchase price		$ 16,300
Blake Group Holdings, Inc. [Member]
Business Acquisition
Business acquisition, percentage of voting interests acquired		100.00%					100.00%
Total purchase price		$ 28,500
Minetuff Dewatering Pumps Australiz Pty Ltd
Business Acquisition
Business acquisition, percentage of voting interests acquired			100.00%
Total purchase price			$ 13,700
Puronics, Inc.
Business Acquisition
Business acquisition, percentage of voting interests acquired				100.00%		100.00%
New Aqua, LLC
Business Acquisition
Business acquisition, percentage of voting interests acquired				100.00%		100.00%
Intangible assets				$ 93,200		$ 93,200
Atlantic Turbine Pump, LLC
Business Acquisition
Business Combination, Bargain Purchase, Gain Recognized, Amount				400
Series of Individually Immaterial Business Acquisitions
Business Acquisition
Total purchase price				$ 185,500
Business Combination, Bargain Purchase, Gain Recognized, Amount							$ 400
Intangible assets		131,500					131,500
Goodwill		66,200					66,200
Business Acquisition, Goodwill, Expected Tax Deductible Amount		$ 62,300					$ 62,300
Minimum \| Series of Individually Immaterial Business Acquisitions
Business Acquisition
Acquired intangible assets useful life							12 years
Maximum \| Series of Individually Immaterial Business Acquisitions
Business Acquisition
Acquired intangible assets useful life							20 years