Condensed Consolidated Income Statements - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
NET SALES	$ 352,499	$ 388,944	$ 710,192	$ 775,392
Cost of sales	312,504	335,385	637,075	671,842
GROSS PROFIT	39,995	53,559	73,117	103,550
Selling, general and administrative expenses	15,964	22,289	30,447	44,646
INCOME FROM OPERATIONS	24,031	31,270	42,670	58,904
Interest expense, net	(11,852)	(13,182)	(23,725)	(25,039)
Other income (expense), net	2,539	(570)	2,040	(3,558)
Change in fair value of redeemable preferred stock embedded derivative	93	(4,588)	719	(3,690)
INCOME BEFORE INCOME TAXES	14,811	12,930	21,704	26,617
Income tax provision	(7,541)	(4,795)	(12,484)	(8,165)
NET INCOME	$ 7,270	$ 8,135	$ 9,220	$ 18,452
EARNINGS (LOSS) PER SHARE – BASIC	$ (0.04)	$ (0.02)	$ (0.27)	$ 0.05
EARNINGS (LOSS) PER SHARE – DILUTED	$ (0.04)	$ (0.02)	$ (0.27)	$ 0.05