Revenue (Revenue by Customer Type) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 979,896	$ 946,375	$ 1,900,775	$ 1,771,780
Single-family homebuilders [Member]
Disaggregation of Revenue [Line Items]
Net sales	702,388	716,974	1,377,159	1,345,692
Remodeling contractors [Member]
Disaggregation of Revenue [Line Items]
Net sales	127,699	110,313	232,368	198,521
Multi-family, commercial & other contractors [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 149,809	$ 119,088	$ 291,248	$ 227,567