CONDENSED CONSOLIDATED STATEMENTS OF (LOSS) INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Net sales		$ 1,269,383	$ 1,352,296
Cost of goods sold		1,083,715	1,152,214
Gross profit		185,668	200,082
Operating expenses:
Warehousing, marketing and administrative expenses		173,022	167,678
Impairment of goodwill		198,828
Operating (loss) income		(186,182)	32,404
Interest expense, net		6,739	5,897
(Loss) income before income taxes		(192,921)	26,507
Income tax (benefit) expense		(4,328)	9,977
Net (loss) income		$ (188,593)	$ 16,530
Net (loss) income per share - basic:		$ (5.15)	$ 0.45
Average number of common shares outstanding - basic		36,644	36,593
Net (loss) income per share - diluted:	[1]	$ (5.15)	$ 0.45
Average number of common shares outstanding - diluted		36,644	36,875
Dividends declared per share		$ 0.14	$ 0.14

[1] As a result of the net loss in the three months ended March 31, 2017, the effect of potentially dilutive securities would have been anti-dilutive and has been omitted from the calculation of diluted earnings per share.