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SEGMENT REPORTING, Business Segmented Financial Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Segment Reporting Information, Profit (Loss) [Abstract]        
Sales $ 311,227 $ 250,698 $ 597,163 $ 489,225
Income (loss) from operations 20,060 10,257 31,209 18,493
Reportable Segment [Member]        
Segment Reporting Information, Profit (Loss) [Abstract]        
Sales 311,227 250,698 597,163 489,225
Amortization 4,119 4,291 8,477 8,607
Income (loss) from operations 31,025 19,599 52,932 36,191
Income from operations, excluding amortization 35,144 23,890 61,409 44,798
Reportable Segment [Member] | Service Centers [Member]        
Segment Reporting Information, Profit (Loss) [Abstract]        
Sales 193,576 164,749 368,937 313,461
Amortization 2,310 2,227 4,770 4,477
Income (loss) from operations 19,623 16,190 32,992 27,281
Income from operations, excluding amortization 21,933 18,417 37,762 31,758
Reportable Segment [Member] | Innovative Pumping Solutions [Member]        
Segment Reporting Information, Profit (Loss) [Abstract]        
Sales 74,257 44,470 141,899 93,528
Amortization 1,538 1,793 3,165 3,588
Income (loss) from operations 7,418 (38) 12,173 1,676
Income from operations, excluding amortization 8,956 1,755 15,338 5,264
Reportable Segment [Member] | Supply Chain Services [Member]        
Segment Reporting Information, Profit (Loss) [Abstract]        
Sales 43,394 41,479 86,327 82,236
Amortization 271 271 542 542
Income (loss) from operations 3,984 3,447 7,767 7,234
Income from operations, excluding amortization $ 4,255 $ 3,718 $ 8,309 $ 7,776