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CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Statement [Abstract]        
Revenues $ 38,067 $ 57,195 $ 72,793 $ 117,860
Cost of goods sold 36,118 45,842 71,072 90,883
Gross profit (loss) 1,949 11,353 1,721 26,977
Research and development expenses 104 141 213 241
Selling, general and administrative expenses 3,148 3,449 6,782 6,291
Operating income (loss) (1,303) 7,763 (5,274) 20,445
Interest expense        
Interest rate expense (2,485) (2,530) (5,031) (5,450)
Amortization expense (2,405) (2,502) (4,128) (4,620)
Loss on debt extinguishment 0 0 (330) (115)
Gain (loss) on sale or disposal of assets 0 (119) 0 (119)
Other income (expense) (94) 110 (161) 274
Income (loss) before income taxes (6,287) 2,722 (14,924) 10,415
Income tax expense 0 0 (6) (6)
Net income (loss) (6,287) 2,722 (14,930) 10,409
Other comprehensive income        
Foreign currency translation adjustment (84) 0 (46) 108
Comprehensive income (loss) $ (6,371) $ 2,722 $ (14,976) $ 10,517
Net income(loss) per common share        
Basic $ (0.32) $ 0.13 $ (0.74) $ 0.52
Diluted $ (0.32) $ 0.13 $ (0.74) $ 0.49
Weighted average shares outstanding        
Basic 19,590 20,284 20,090 20,146
Diluted 19,590 20,948 20,090 21,299