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SEGMENT REPORTING (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Adjustment for [Abstract]        
B27 settlement $ 7,348 $ 0 $ 7,348  
Impairment 58,888 0 58,888  
Amortization of intangibles     15,907 $ 13,874
Total operating income (loss) (55,612) 30,798 (23,518) 79,344
Interest expense 2,630 3,295 7,905 9,868
Other expense (income), net 327 10 (67) 1
Income (loss) before income taxes (58,569) 27,493 (31,356) 69,475
Service Centers [Member]        
Adjustment for [Abstract]        
Impairment   10,900   10,900
IPS [Member]        
Adjustment for [Abstract]        
Impairment 48,000   48,000  
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Sales 303,080 387,053 968,362 1,117,160
Operating income for reportable segments 27,917 [1] 48,144 93,455 [1] 130,108
Operating Segments [Member] | Service Centers [Member]        
Segment Reporting Information [Line Items]        
Sales 199,306 255,041 639,212 735,104
Operating income for reportable segments 17,957 [1] 29,444 61,943 [1] 79,356
Operating Segments [Member] | IPS [Member]        
Segment Reporting Information [Line Items]        
Sales 61,458 88,614 202,627 259,070
Operating income for reportable segments 6,139 [1] 14,979 20,667 [1] 40,328
Operating Segments [Member] | SCS [Member]        
Segment Reporting Information [Line Items]        
Sales 42,316 43,398 126,523 122,986
Operating income for reportable segments 3,821 [1] 3,721 10,835 [1] 10,424
Segment Reconciling Items [Member]        
Adjustment for [Abstract]        
B27 settlement 7,348 0 7,348 0
Impairment 58,888 0 58,888 0
Amortization of intangibles 5,240 5,658 15,907 16,895
Corporate expense $ 12,053 $ 11,688 $ 34,830 $ 33,869
[1] Excludes impairment expense of $48.0 million for IPS and $10.9 for Service Centers.