Revenue (Tables)

9 Months Ended

Sep. 30, 2020

Revenue from Contract with Customer [Abstract]

Disaggregation of revenue

The following table shows net sales classified by major product category for the three and nine months ended September 30, 2020 and 2019:

	Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands)	2020		2019		2020		2019
Millwork, doors & windows	$	299,812	$	285,750	$	883,480	$	796,807
Structural components	185,910		175,344		510,789		483,575
Lumber & lumber sheet goods	383,626		274,908		935,582		798,722
Other building products & services	220,995		228,247		661,267		656,925
Total net sales	$	1,090,343	$	964,249	$	2,991,118	$	2,736,029

The following table reflects the Company’s estimate of net sales by each customer type for the three and nine months ended September 30, 2020 and 2019:

	Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands)	2020		2019		2020		2019
Single-family homebuilders	$	811,081	$	718,690	$	2,188,240	$	2,064,382
Remodeling contractors	143,536		115,756		375,904		314,277
Multi-family, commercial & other contractors	135,726		129,803		426,974		357,370
Total net sales	$	1,090,343	$	964,249	$	2,991,118	$	2,736,029

Contract balances

The following table reflects the Company’s contract balances as of September 30, 2020 and December 31, 2019:

(in thousands)	September 30, 2020		December 31, 2019		Change
Receivables, including unbilled receivables presented in prepaid expenses and other current assets	$	409,640	$	333,044	$	76,596
Contract assets	36,422		32,125		4,297
Contract liabilities	$	44,980	$	31,094	$	13,886