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Revenue

3 Months Ended

Mar. 31, 2020

Revenue From Contract With Customer [Abstract]

2. Revenue

The following table disaggregates our sales by product category (in thousands):

	Three Months Ended March 31,
	2020		2019
Lumber & lumber sheet goods	$	552,481	$	517,689
Manufactured products		354,457		317,352
Windows, doors & millwork		391,317		353,390
Gypsum, roofing & insulation		110,852		120,919
Siding, metal & concrete products		168,885		149,918
Other building products & services		209,029		172,032
Net sales	$	1,787,021	$	1,631,300

Information regarding disaggregation of sales by segment is discussed in Note 11 to the condensed consolidated financial statements. Sales related to contracts with service elements represents less than 10% of the Company’s net sales for each period presented.

The timing of revenue recognition, billings and cash collections results in accounts receivable, unbilled receivables, contract assets and contract liabilities. Contract asset balances were not significant as of March 31, 2020 or December 31, 2019. Contract liabilities consist of deferred revenue and customer advances and deposits. Contract liability balances are included in accrued liabilities on our consolidated balance sheet and were $36.6 million and $38.6 million as of March 31, 2020 and December 31, 2019, respectively.