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SEGMENT REPORTING (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Segment Reporting Information [Line Items]    
Sales $ 253,561 $ 341,594
Operating income for reportable segments 13,322 34,771
Adjustment for [Abstract]    
Amortization of intangibles 4,528 5,358
Corporate expense 10,796 11,314
Total operating income (loss) (2,002) 18,099
Interest expense 3,409 2,683
Other expense (income), net (155) (249)
Income (loss) before income taxes (5,256) 15,665
Operating Segments [Member] | Service Centers [Member]    
Segment Reporting Information [Line Items]    
Sales 167,502 225,792
Operating income for reportable segments 9,536 22,866
Operating Segments [Member] | IPS [Member]    
Segment Reporting Information [Line Items]    
Sales 47,431 74,263
Operating income for reportable segments 306 8,626
Operating Segments [Member] | SCS [Member]    
Segment Reporting Information [Line Items]    
Sales 38,628 41,539
Operating income for reportable segments $ 3,480 $ 3,279