Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Revenue	$ 499,076	$ 580,185	$ 1,597,837	$ 1,805,662
Cost of sales, including warehousing, distribution and occupancy	336,448	395,483	1,038,374	1,206,351
Gross profit	162,628	184,702	559,463	599,311
Selling, general, and administrative	135,795	149,903	427,938	469,164
Long-lived asset impairments	0	14,556	0	14,556
Loss on net asset exchange for the formation of the joint ventures	0	0	21,293	0
Other loss (income), net	179	282	(622)	357
Operating income	26,654	19,961	110,854	115,234
Interest expense, net	24,456	35,732	82,376	90,448
Gain on convertible debt repurchase	0	0	(3,214)	0
Loss on forward contracts for the issuance of convertible preferred stock	0	0	16,787	0
Loss on debt refinancing	0	0	0	16,740
Income (loss) before income taxes	2,198	(15,771)	14,905	8,046
Income tax expense (benefit)	5,733	(7,181)	20,719	(2,895)
(Loss) income before income from equity method investments	(3,535)	(8,590)	(5,814)	10,941
Income from equity method investments	1,117	0	4,192	0
Net (loss) income	$ (2,418)	$ (8,590)	$ (1,622)	$ 10,941
(Loss) earning per share:
Basic (in dollars per share)	$ (0.09)	$ (0.10)	$ (0.18)	$ 0.13
Diluted (in dollars per share)	$ (0.09)	$ (0.10)	$ (0.18)	$ 0.13
Weighted average common shares outstanding:
Basic weighted-average shares (in shares)	83,823	83,412	83,667	83,326
Diluted weighted-average shares (in shares)	83,823	83,412	83,667	83,431