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SEGMENT AND GEOGRAPHICAL REPORTING, Business Segmented Financial Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Sales $ 1,247,043 $ 1,499,662 $ 1,241,510
Operating income for reportable segments, excluding impairment expense 113,967 172,655  
Operating income for reportable segments     153,398
Identifiable assets at year end 660,710 825,047 615,034
Capital expenditures 12,172 8,265 6,884
Depreciation 10,891 11,194 8,582
Amortization 20,621 22,480 11,830
Interest expense 10,932 12,797 6,282
Impairment expense by segment 68,735 117,569 0
Reportable Segment [Member]      
Segment Reporting Information [Line Items]      
Operating income for reportable segments 113,967 172,655 153,398
Reportable Segment [Member] | Service Centers [Member]      
Segment Reporting Information [Line Items]      
Sales 826,588 987,561 884,821
Operating income for reportable segments, excluding impairment expense 78,170 107,699  
Operating income for reportable segments     107,142
Identifiable assets at year end 451,333 568,182 500,978
Capital expenditures 3,185 4,100 6,321
Depreciation 7,734 8,416 7,770
Amortization 10,334 11,281 8,574
Interest expense 2,967 3,422  
Impairment expense by segment 15,842 10,210  
Reportable Segment [Member] | Innovative Pumping Solutions [Member]      
Segment Reporting Information [Line Items]      
Sales 254,829 348,134 209,175
Operating income for reportable segments, excluding impairment expense 21,584 51,162  
Operating income for reportable segments     33,766
Identifiable assets at year end 159,365 202,228 66,007
Capital expenditures 8,383 4,043 357
Depreciation 2,930 2,381 446
Amortization 8,406 8,993 1,043
Interest expense 6,881 8,451  
Impairment expense by segment 52,893 107,359  
Reportable Segment [Member] | Supply Chain Services [Member]      
Segment Reporting Information [Line Items]      
Sales 165,626 163,967 147,514
Operating income for reportable segments, excluding impairment expense 14,213 13,794  
Operating income for reportable segments     12,490
Identifiable assets at year end 50,012 54,637 48,049
Capital expenditures 604 122 206
Depreciation 227 397 366
Amortization 1,881 2,206 $ 2,213
Interest expense 1,084 924  
Impairment expense by segment $ 0 $ 0