CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net sales	$ 920,879	$ 825,405
Cost of sales	683,751	609,283
Gross profit	237,128	216,122
Selling, general and administrative expenses	186,922	169,934
Depreciation expense	11,519	9,573
Amortization expense	5,013	4,347
Merger and integration costs	1,168	2,790
Total operating expenses	204,622	186,644
Income from operations	32,506	29,478
Other income (expense)
Interest expense	(5,932)	(6,038)
Other income, net	2,919	2,910
Income before income taxes	29,493	26,350
Income tax expense	7,464	6,000
Net income	$ 22,029	$ 20,350
Weighted average common shares outstanding
Basic (in shares)	66,839	66,782
Diluted (in shares)	67,643	67,282
Net income per common share
Basic (in dollars per share)	$ 0.33	$ 0.30
Diluted (in dollars per share)	$ 0.33	$ 0.30
Building Products [Member]
Net sales	$ 686,700	$ 620,900
Construction Services [Member]
Net sales	$ 234,200	$ 204,500