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BUSINESS ACQUISITIONS - Narrative (Details) shares in Thousands |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 01, 2021 USD ($) rate | Apr. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 20, 2020 USD ($) | Feb. 01, 2020 USD ($) | Jan. 01, 2020 USD ($) | Dec. 31, 2021 USD ($) entity shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash and stock paid for acquisition |  |  |  |  |  |  | $ 65,100,000 |  |
Acquired intangibles |  |  |  |  |  |  | 16,259,000 | $ 39,797,000 |
Goodwill |  |  | $ 261,767,000 |  |  |  | 308,506,000 | $ 261,767,000 | $ 194,052,000
Acquisition related costs |  |  |  |  |  |  | 300,000 |  |
Measurement period adjustments to increase goodwill |  |  |  |  |  |  | $ 1,400,000 |  |
Non-compete agreements |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Amortization term of acquired intangibles |  |  |  |  |  |  | 4 years 1 month 6 days |  |
Customer relationships |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Amortization term of acquired intangibles |  |  |  |  |  |  | 6 years 7 months 6 days |  |
2021 Acquisitions |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash and stock paid for acquisition |  |  |  |  |  |  | $ 65,100,000 |  |
Cash consideration paid |  |  |  |  |  |  | 53,700,000 |  |
Future consideration |  |  |  |  |  |  | 300,000 |  |
Acquired intangibles |  |  |  |  |  |  | 62,000,000 |  |
Goodwill |  |  |  |  |  |  | 45,749,000 |  |
Fair value of accounts receivable acquired |  |  |  |  |  |  | $ 6,781,000 |  |
Number of completed acquisitions | entity |  |  |  |  |  |  | 3 |  |
2021 Acquisitions | Common Stock |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of shares issued in acquisitions (in shares) | shares |  |  |  |  |  |  | 434 |  |
2021 Acquisitions | Non-compete agreements |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquired intangibles |  |  |  |  |  |  | $ 1,000,000 |  |
Amortization term of acquired intangibles |  |  |  |  |  |  | 5 years |  |
2021 Acquisitions | Customer relationships |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquired intangibles |  |  |  |  |  |  | $ 15,200,000 |  |
Amortization term of acquired intangibles |  |  |  |  |  |  | 8 years |  |
CVI |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash and stock paid for acquisition |  | $ 49,700,000 |  |  |  |  |  |  |
Sales contributed since acquisition |  |  |  |  |  |  | $ 17,900,000 |  |
Net income (loss) contributed since acquisition |  |  |  |  |  |  | 2,500,000 |  |
PMI |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash and stock paid for acquisition | $ 9,600,000 |  |  |  |  |  |  |  |
Sales contributed since acquisition |  |  |  |  |  |  | 5,200,000 |  |
Net income (loss) contributed since acquisition |  |  |  |  |  |  | 700,000 |  |
Achievement of annual gross revenue target period | 2 years |  |  |  |  |  |  |  |
Lower range of undiscounted amounts to pay under contingent consideration | $ 0 |  |  |  |  |  |  |  |
Higher range of undiscounted amounts to pay under contingent consideration | 2,500,000 |  |  |  |  |  |  |  |
PMI | Fair Value, Inputs, Level 3 | Contingent Consideration Liability | Income approach |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Fair value of contingent consideration liability | $ 300,000 |  |  |  |  |  |  |  |
Discount rate | rate | 0.076 |  |  |  |  |  |  |  |
Premier |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash and stock paid for acquisition |  |  |  | $ 5,800,000 |  |  |  |  |
Sales contributed since acquisition |  |  |  |  |  |  | 500,000 |  |
Net income (loss) contributed since acquisition |  |  |  |  |  |  | $ (162,000) |  |
TEC |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash and stock paid for acquisition |  |  | 64,700,000 |  |  |  |  |  |
APO |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash and stock paid for acquisition |  |  | 53,000,000 |  |  |  |  |  |
Cash consideration paid |  |  | 38,300,000 |  |  |  |  |  |
Future consideration |  |  | 13,400,000 |  |  |  |  |  |
Pumping Solutions |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash and stock paid for acquisition |  |  | 21,000,000 |  |  |  |  |  |
CEC |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash and stock paid for acquisition |  |  | $ 3,300,000 |  |  |  |  |  |
Turbo |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash consideration paid |  |  |  |  | $ 3,200,000 |  |  |  |
PSI |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash and stock paid for acquisition |  |  |  |  |  | $ 13,000,000 |  |  |

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