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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Net sales $ 140,696 $ 105,033 $ 238,812 $ 188,444
Cost of sales 105,688 86,012 195,744 166,872
Gross profit 35,008 19,021 43,068 21,572
Selling, general and administrative expense 8,545 8,504 17,338 18,510
Other expense (income), net 6 (167) (257) (635)
Operating income 26,457 10,684 25,987 3,697
Interest expense, net 12,290 12,476 24,662 25,955
Gain on extinguishment of debt (10,000)   (10,000)  
Non-operating other expense (income), net 745 (128) 1,140 (803)
Income (loss) before benefit for income taxes 23,422 (1,664) 10,185 (21,455)
Benefit for income taxes (248) (1,299) (206) (1,638)
Net income (loss) 23,670 (365) 10,391 (19,817)
Dividends on convertible preferred stocks 75 75 150 150
Net income attributable to participating securities 223      
Net income (loss) attributable to common stockholders $ 12,646 $ (9,634) $ (10,507) $ (37,972)
Basic:        
Net income (loss) $ 0.44 $ (0.34) $ (0.37) $ (1.35)
Diluted:        
Net income (loss) $ 0.42 $ (0.34) $ (0.37) $ (1.35)
Series E Preferred Stock [Member]        
Dividends on Series E redeemable preferred stock $ 10,213 $ 8,689 $ 19,724 $ 16,996
Accretion of Series E redeemable preferred stock $ 513 $ 505 $ 1,024 $ 1,009