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BUSINESS ACQUISITIONS - Narrative (Details) |  |  |  |  | 12 Months Ended | 36 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) | Feb. 01, 2020 USD ($) | Jan. 01, 2020 USD ($) | Jan. 01, 2018 USD ($) | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2020 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash consideration paid |  |  |  |  | $ 115,247,000 | $ 0 | $ 10,811,000 |
Acquired intangibles |  |  |  |  | 39,797,000 |  |  |
Goodwill | $ 248,339,000 |  |  |  | 248,339,000 | 194,052,000 | $ 194,052,000 | $ 248,339,000
Service Centers |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill | 231,200,000 |  |  |  | $ 231,200,000 | 160,934,000 |  | 231,200,000
Non-compete agreements |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Amortization term of acquired intangibles |  |  |  |  | 4 years 10 months 24 days |  |  |
Customer relationships |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Amortization term of acquired intangibles |  |  |  |  | 7 years 3 months 18 days |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Contingent Consideration Liability |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Fair value of contingent consideration liability | 1,100,000 |  |  |  | $ 1,100,000 | $ 2,705,000 |  | 1,100,000
2020 Acquisitions |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash consideration paid |  |  |  |  |  |  |  | 115,247,000
Acquired intangibles |  |  |  |  | 39,800,000 |  |  |
Goodwill | 90,722,000 |  |  |  | 90,722,000 |  |  | 90,722,000
Fair value of accounts receivable acquired | 20,204,000 |  |  |  | 20,204,000 |  |  | 20,204,000
Gross contractual amount of receivables acquired | 21,100,000 |  |  |  | 21,100,000 |  |  | 21,100,000
Receivables acquired expected to be uncollectible | 900,000 |  |  |  | 900,000 |  |  | 900,000
Acquisition related costs |  |  |  |  | 172,000 |  |  |
Fair value of stock issued in acquisition |  |  |  |  |  |  |  | 29,367,000
2020 Acquisitions | Service Centers |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill | 90,700,000 |  |  |  | 90,700,000 |  |  | 90,700,000
Goodwill expected to be deductible for tax purposes | 0 |  |  |  | 0 |  |  | 0
2020 Acquisitions | Non-compete agreements |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquired intangibles |  |  |  |  | $ 2,300,000 |  |  |
Amortization term of acquired intangibles |  |  |  |  | 5 years |  |  |
2020 Acquisitions | Customer relationships |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquired intangibles |  |  |  |  | $ 37,500,000 |  |  |
Amortization term of acquired intangibles |  |  |  |  | 8 years |  |  |
2020 Acquisitions | Common Stock |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of shares issued in acquisitions (in shares) | shares |  |  |  |  | 1,480,909 |  |  |
TEC |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase price acquisition in cash and stock | 64,700,000 |  |  |  |  |  |  |
APO |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase price acquisition in cash and stock | 38,300,000 |  |  |  |  |  |  |
Pumping Solutions |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase price acquisition in cash and stock | 21,000,000.0 |  |  |  |  |  |  |
CEC |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase price acquisition in cash and stock | 4,500,000 |  |  |  |  |  |  |
PSI and Turbo |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Percentage of revenue contributed by acquisitions |  |  |  |  | 0.019 |  |  |
Percentage of net income (loss) contributed by acquisitions |  |  |  |  | (0.029) |  |  |
Sales contributed by acquiree since acquisition |  |  |  |  | $ 19,600,000 |  |  |
Earnings before taxes contributed by acquiree since acquisition |  |  |  |  | 800,000 |  |  |
Turbo |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash consideration paid |  | $ 3,200,000 |  |  |  |  |  |
Additional goodwill recognized from acquisitions |  |  |  |  | 0 |  |  |
PSI |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase price acquisition in cash and stock |  |  | $ 13,000,000.0 |  |  |  |  |
Additional goodwill recognized from acquisitions |  |  |  |  | 463,000 |  |  |
ASI |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase price acquisition in cash and stock |  |  |  | $ 11,700,000 |  |  |  |
Cash consideration paid |  |  |  | 10,800,000 |  |  |  |
Liability for contingent consideration |  |  |  | 4,600,000 |  |  |  |
Fair value of stock issued in acquisition |  |  |  | 900,000 |  |  |  |
Contingent consideration, maximum |  |  |  | $ 4,600,000 |  |  |  |
Payment period for contingent consideration |  |  |  | 3 years |  |  |  |
Contingent consideration liability, current | 1,100,000 |  |  |  | 1,100,000 |  |  | 1,100,000
ASI | Fair Value, Inputs, Level 3 |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Contingent consideration, maximum |  |  |  | $ 4,000,000.0 |  |  |  |
ASI | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Contingent Consideration Liability |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Fair value of contingent consideration liability | $ 1,100,000 |  |  |  | $ 1,100,000 |  |  | $ 1,100,000

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