Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Condensed Consolidated Statements of Comprehensive Loss
Net sales	$ 1,287,624	$ 1,416,078	$ 2,544,432	$ 2,758,562
Cost of sales	(1,214,897)	(1,317,662)	(2,392,485)	(2,569,768)
Gross profit	72,727	98,416	151,947	188,794
Selling, general and administrative expenses	(80,816)	(90,642)	(163,684)	(172,329)
Goodwill impairments	(122,891)		(122,891)
Impairments of definite-lived intangible assets	(17,979)		(17,979)
(Loss) income from operations	(148,959)	7,774	(152,607)	16,465
Other (expense) income:
Interest expense	(10,170)	(10,392)	(20,385)	(20,819)
Other	101	394	282	811
Total other expense	(10,069)	(9,998)	(20,103)	(20,008)
Loss before income taxes	(159,028)	(2,224)	(172,710)	(3,543)
Income tax expense	(434)	(1,740)	(1,053)	(871)
Net loss	(159,462)	(3,964)	(173,763)	(4,414)
Other comprehensive loss, net of tax	(3,358)	(962)	(5,485)	(962)
Total comprehensive loss	$ (162,820)	$ (4,926)	$ (179,248)	$ (5,376)
Loss per common share, basic and diluted (in dollars per share)	$ (2.13)	$ (0.05)	$ (2.33)	$ (0.06)
Weighted average common shares outstanding, basic and diluted (in shares)	74,730,823	74,158,622	74,595,906	74,077,916