CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net sales
Net sales	$ 886,375	$ 797,547	$ 1,644,075	$ 1,524,965
Cost of sales
Cost of sales	674,688	605,892	1,254,191	1,166,693
Gross profit	211,687	191,655	389,884	358,272
Selling, general and administrative expenses	157,789	139,897	306,677	281,678
Depreciation expense	10,941	9,290	21,502	18,082
Amortization expense	4,100	5,288	7,921	10,533
Merger and integration costs	6,324	3,597	10,765	6,433
Impairment of assets	26	0	26	11,883
Total operating expenses	179,180	158,072	346,891	328,609
Income from operations	32,507	33,583	42,993	29,663
Other income (expense)
Interest expense	(6,495)	(8,121)	(12,583)	(16,352)
Other income, net	964	1,411	1,283	2,866
Income before income taxes	26,976	26,873	31,693	16,177
Income tax expense	9,380	8,891	10,353	4,951
Net income	$ 17,596	$ 17,982	$ 21,340	$ 11,226
Weighted average common shares outstanding
Basic (in shares)	66,927	65,839	66,810	65,589
Diluted (in shares)	67,394	66,417	67,290	66,137
Net income per common share
Basic (in dollars per share)	$ 0.26	$ 0.27	$ 0.32	$ 0.17
Diluted (in dollars per share)	$ 0.26	$ 0.27	$ 0.32	$ 0.17