Revenue (Revenue by Customer Type) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 1,090,343	$ 964,249	$ 2,991,118	$ 2,736,029
Single-family homebuilders [Member]
Disaggregation of Revenue [Line Items]
Net sales	811,081	718,690	2,188,240	2,064,382
Remodeling contractors [Member]
Disaggregation of Revenue [Line Items]
Net sales	143,536	115,756	375,904	314,277
Multi-family, commercial & other contractors [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 135,726	$ 129,803	$ 426,974	$ 357,370