Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Revenue	$ 580,185	$ 612,953	$ 1,805,662	$ 1,918,139
Cost of sales, including warehousing, distribution and occupancy	395,483	411,661	1,206,351	1,277,202
Gross profit	184,702	201,292	599,311	640,937
Selling, general, and administrative	149,903	156,051	469,164	481,618
Long-lived asset impairments	14,556	3,861	14,556	23,217
Other loss (income), net	282	1,579	357	(40)
Operating income	19,961	39,801	115,234	136,142
Interest expense, net	35,732	16,339	90,448	48,300
Loss on debt refinancing	0	0	16,740	0
(Loss) income before income taxes	(15,771)	23,462	8,046	87,842
Income tax expense (benefit)	(7,181)	2,406	(2,895)	25,398
Net (loss) income	$ (8,590)	$ 21,056	$ 10,941	$ 62,444
Earnings per share
Basic (in dollars per share)	$ (0.10)	$ 0.31	$ 0.13	$ 0.91
Diluted (in dollars per share)	$ (0.10)	$ 0.31	$ 0.13	$ 0.91
Weighted average common shares outstanding
Basic (in shares)	83,412	68,354	83,326	68,296
Diluted (in shares)	83,412	68,569	83,431	68,411