Revenue (Tables)

3 Months Ended

Mar. 31, 2020

Revenue from Contract with Customer [Abstract]

Disaggregation of revenue

The following table shows net sales classified by major product category for the three months ended March 31, 2020 and 2019:

	Three Months Ended March 31,
(in thousands)	2020		2019
Millwork, doors & windows	$	295,669	$	239,922
Structural components	160,344		141,276
Lumber & lumber sheet goods	259,139		241,959
Other building products & services	205,727		202,248
Total net sales	$	920,879	$	825,405

The following table reflects the Company’s estimate of net sales by each customer type for the three months ended March 31, 2020 and 2019:

	Three Months Ended March 31,
(in thousands)	2020		2019
Single-family homebuilders	$	674,771	$	628,718
Remodeling contractors	104,669		88,208
Multi-family, commercial & other contractors	141,439		108,479
Total net sales	$	920,879	$	825,405

Contract balances

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

(in thousands)	March 31,   2020		December 31,   2019		Change
Receivables, including unbilled receivables presented in prepaid expenses and other current assets	$	364,398	$	333,044	$	31,354
Contract assets	38,339		32,125		6,214
Contract liabilities	$	37,859	$	31,094	$	6,765