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CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Income Statement [Abstract]        
Revenues $ 38,510 $ 48,348 $ 111,303 $ 166,208
Cost of goods sold 37,476 40,633 108,548 131,516
Gross profit (loss) 1,034 7,715 2,755 34,692
Research and development expenses 117 101 330 342
Selling, general and administrative expenses 2,774 2,972 9,556 9,263
Operating income (loss) (1,857) 4,642 (7,131) 25,087
Interest expense        
Interest rate expense (2,610) (2,287) (7,641) (7,737)
Amortization expense (1,258) (741) (5,386) (5,361)
Loss on debt extinguishment 0 (1,231) (330) (1,346)
Loss on sale or disposal or assets 0 0 0 (119)
Other income (expense) (30) 81 (191) 355
Income (loss) before income taxes (5,755) 464 (20,679) 10,879
Income tax expense 0 0 (6) (6)
Net income (loss) (5,755) 464 (20,685) 10,873
Other comprehensive income        
Foreign currency translation adjustment (104) (98) (150) 10
Comprehensive income (loss) $ (5,859) $ 366 $ (20,835) $ 10,883
Net income(loss) per common share        
Basic $ (0.29) $ 0.02 $ (1.04) $ 0.54
Diluted $ (0.29) $ 0.02 $ (1.04) $ 0.52
Weighted average shares outstanding        
Basic 19,521 20,555 19,898 20,284
Diluted 19,521 21,476 19,898 20,946