Consolidated Income Statements - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
NET SALES	$ 1,372,487	$ 1,501,827	$ 1,108,055
Cost of sales:
Cost of sales	1,256,425	1,338,300	1,005,158
GROSS PROFIT	116,062	163,527	102,897
Selling, general and administrative expenses	63,883	77,722	81,379
Impairment of goodwill and indefinite-lived intangibles	102,238
INCOME (LOSS) FROM OPERATIONS	(50,059)	85,805	21,518
Interest expense, net	(47,011)	(50,097)	(40,004)
Other (expense) income, net	4,815	(6,936)	13,188
Change in fair value of redeemable preferred stock embedded derivative	(782)	3,480	6,164
CONSOLIDATED INCOME (LOSS) BEFORE INCOME TAXES	(93,037)	32,252	866
Income tax provision	(3,423)	(6,291)	(6,875)
CONSOLIDATED NET INCOME (LOSS)	(96,460)	25,961	(6,009)
Less: net (loss) attributable to non-controlling interest			(194)
NET INCOME (LOSS) ATTRIBUTABLE TO SUPERIOR	$ (96,460)	$ 25,961	$ (6,203)
EARNINGS (LOSS) PER SHARE – BASIC	$ (5.10)	$ 0.29	$ (1.01)
EARNINGS (LOSS) PER SHARE – DILUTED	$ (5.10)	$ 0.29	$ (1.01)