Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net sales	$ 84,712	$ 147,930	$ 211,322	$ 297,457
Costs and expenses:
Cost of materials (exclusive of depreciation)	60,900	109,941	153,196	220,899
Warehouse, processing and delivery expense	14,154	20,541	32,190	40,818
Sales, general and administrative expense	12,086	16,477	28,300	32,979
Depreciation expense	2,038	2,130	4,114	4,251
Total costs and expenses	89,178	149,089	217,800	298,947
Operating loss	(4,466)	(1,159)	(6,478)	(1,490)
Interest expense, net	5,093	9,850	15,069	19,299
Unrealized gain on embedded debt conversion option	(2,010)	0	(2,010)	0
Other (income) expense, net	(2,048)	(2,480)	(1,852)	(4,082)
Loss before income taxes	(5,501)	(8,529)	(17,685)	(16,707)
Income tax benefit	(1,448)	(225)	(2,591)	(400)
Net loss	$ (4,053)	$ (8,304)	$ (15,094)	$ (16,307)
Basic and diluted loss per common share (in usd per share)	$ (0.06)	$ (3.77)	$ (0.38)	$ (7.58)
Comprehensive loss:
Net loss	$ (4,053)	$ (8,304)	$ (15,094)	$ (16,307)
Change in unrecognized pension and postretirement benefit costs, net of tax	25	23	50	46
Foreign currency translation adjustments, net of tax	36	(279)	(912)	(743)
Comprehensive loss	$ (3,992)	$ (8,560)	$ (15,956)	$ (17,004)