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Revenue
 3 Months Ended
Mar. 31, 2021
Revenue From Contract With Customer [Abstract]  
Revenue

3. Revenue

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

 

 

Three Months Ended

March 31,

 

 

2021

 

 

2020

 

Lumber & lumber sheet goods

$

1,728,495

 

 

$

552,481

 

Manufactured products

 

816,133

 

 

 

354,457

 

Windows, doors & millwork

 

718,557

 

 

 

391,317

 

Gypsum, roofing & insulation

 

146,440

 

 

 

110,852

 

Siding, metal & concrete products

 

301,910

 

 

 

168,885

 

Other building products & services

 

462,240

 

 

 

209,029

 

Net sales

$

4,173,775

 

 

$

1,787,021

 

 

Net sales from installation and construction services was 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 are included in accounts receivable on our consolidated balance sheet and were $179.6 million and $57.3 million as of March 31, 2021 and December 31, 2020, respectively. 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 $121.2 million and $58.5 million as of March 31, 2021 and December 31, 2020, respectively. The increase in contract assets and liabilities during the three months ended March 31, 2021 was primarily related to contract assets and liabilities acquired in the BMC Merger.