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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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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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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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity.

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ACQUISITIONS (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended					12 Months Ended
ACQUISITIONS (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2021
Business Acquisition
Goodwill	$ 329,388	$ 329,630				$ 329,630
Business Combination, Acquisition Related Costs	200				$ 100
B&R Industries, Inc.
Business Acquisition
Business acquisition, percentage of voting interests acquired		100.00%				100.00%
Total purchase price		$ 16,200
Blake Group Holdings, Inc. [Member]
Business Acquisition
Business acquisition, percentage of voting interests acquired		100.00%				100.00%
Total purchase price		$ 28,600
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%
New Aqua, LLC
Business Acquisition
Business acquisition, percentage of voting interests acquired				100.00%
Intangible assets				$ 93,700
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		131,900				131,900
Goodwill		65,400				65,400
Business Acquisition, Goodwill, Expected Tax Deductible Amount		$ 61,600				$ 61,600
Business Acquisition, Pro Forma Revenue	$ 48,200				$ 45,300
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