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SEGMENT REPORTING - Financial Information of Company's Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |
Sales | $ 308,028 | $ 251,930 | $ 905,191 | $ 741,155
Operating Segments |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |
Sales | 308,028 | 251,930 | 905,191 | 741,155
Income from operations | 33,249 | 21,370 | 94,658 | 66,169
Operating Segments | Service Centers |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |
Sales | 187,763 | 160,863 | 556,700 | 474,324
Income from operations | 20,590 | 15,550 | 58,353 | 47,308
Operating Segments | Innovative Pumping Solutions |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |
Sales | 76,662 | 51,027 | 218,561 | 144,555
Income from operations | 8,773 | 1,838 | 24,109 | 7,103
Operating Segments | Supply Chain Services |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |
Sales | 43,603 | 40,040 | 129,930 | 122,276
Income from operations | $ 3,886 | $ 3,982 | $ 12,196 | $ 11,758

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