Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net sales	$ 149,527	$ 145,873
Costs and expenses:
Cost of materials (exclusive of depreciation)	110,958	109,904
Warehouse, processing and delivery expense	20,277	20,355
Sales, general and administrative expense	16,502	16,548
Depreciation expense	2,121	2,376
Total costs and expenses	149,858	149,183
Operating loss	(331)	(3,310)
Interest expense, net	9,449	7,126
Other (income) expense, net	(1,602)	(4,774)
Loss before income taxes	(8,178)	(5,662)
Income tax benefit	(175)	(521)
Net loss	$ (8,003)	$ (5,141)
Basic and diluted loss per common share	$ (3.82)	$ (2.57)
Comprehensive loss:
Change in unrecognized pension and postretirement benefit costs, net of tax	$ 23	$ 0
Foreign currency translation adjustments, net of tax	(464)	(875)
Comprehensive loss	$ (8,444)	$ (6,016)