Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net sales	$ 126,610	$ 149,527
Costs and expenses:
Cost of materials (exclusive of depreciation)	92,296	110,958
Warehouse, processing and delivery expense	18,036	20,277
Sales, general and administrative expense	16,214	16,502
Depreciation expense	2,076	2,121
Total costs and expenses	128,622	149,858
Operating loss	(2,012)	(331)
Interest expense, net	9,976	9,449
Other expense (income), net	196	(1,602)
Loss before income taxes	(12,184)	(8,178)
Income tax benefit	(1,143)	(175)
Net loss	$ (11,041)	$ (8,003)
Basic and diluted loss per common share (in usd per share)	$ (1.67)	$ (3.82)
Comprehensive loss:
Net loss	$ (11,041)	$ (8,003)
Change in unrecognized pension and postretirement benefit costs, net of tax	25	23
Foreign currency translation adjustments, net of tax	(948)	(464)
Comprehensive loss	$ (11,964)	$ (8,444)