CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net sales	$ 964,249	$ 990,264	$ 2,736,029	$ 2,822,927
Cost of sales	709,482	748,961	2,019,363	2,142,941
Gross profit	254,767	241,303	716,666	679,986
Selling, general and administrative expenses	189,284	176,204	540,649	506,236
Depreciation expense	10,501	10,059	30,117	29,323
Amortization expense	4,552	3,790	13,237	11,263
Merger and integration costs	1,295	1,459	5,467	3,627
Impairment of assets	115	0	644	0
Total operating expenses	205,747	191,512	590,114	550,449
Income from operations	49,020	49,791	126,552	129,537
Other income (expense)
Interest expense	(5,773)	(5,926)	(17,385)	(17,916)
Other income, net	3,540	2,953	10,159	7,830
Income before income taxes	46,787	46,818	119,326	119,451
Income tax expense	13,190	10,960	29,680	27,829
Net income	$ 33,597	$ 35,858	$ 89,646	$ 91,622
Weighted average common shares outstanding
Basic (in shares)	66,685	67,329	66,681	67,246
Diluted (in shares)	67,361	67,896	67,240	67,743
Net income per common share
Basic (in dollars per share)	$ 0.50	$ 0.53	$ 1.34	$ 1.36
Diluted (in dollars per share)	$ 0.50	$ 0.53	$ 1.33	$ 1.35
Building Products [Member]
Net sales	$ 728,465	$ 773,787	$ 2,061,766	$ 2,201,863
Cost of sales	528,737	568,713	1,484,384	1,631,022
Construction Services [Member]
Net sales	235,784	216,477	674,263	621,064
Cost of sales	$ 180,745	$ 180,248	$ 534,979	$ 511,919