Revenue Recognition (Tables)

3 Months Ended

Mar. 31, 2018

Revenue from Contract with Customer [Abstract]

Summary of Revenues Disaggregated by End Market and Product

The following tables present our revenues disaggregated by end market and product for the three months ended March 31 (in thousands):

	2018				2017(1)
Residential and multi-family	$	250,114	83	%	$	209,391	82	%
Commercial		51,614	17	%		46,278	18	%
Net revenues	$	301,728	100	%	$	255,669	100	%

	2018				2017(1)
Insulation	$	202,275	67	%	$	175,623	69	%
Waterproofing		22,606	7	%		21,005	8	%
Shower doors, shelving and mirrors		20,260	7	%		12,885	5	%
Garage doors		15,466	5	%		14,287	6	%
Rain gutters		8,658	3	%		8,442	3	%
Other building products		32,463	11	%		23,427	9	%
Net revenues	$	301,728	100	%	$	255,669	100	%

⁽¹⁾  As noted above, prior period amounts have not been adjusted under the modified retrospective method.

Summary of Assets and Liabilities Related to Uncompleted Contracts and Customer Deposits

Contract assets and liabilities related to our uncompleted contracts and customer deposits were as follows as of March 31 and December 31 (in thousands):

	2018			2017
Contract assets	$	18,101		$	6,182
Contract liabilities		(6,963	)		(4,376	)

Schedule of Cost and Estimated Earnings on Uncompleted Contracts

Uncompleted contracts were as follows for the three months ended March 31 and December 31 (in thousands):

	2018		2017
Costs incurred on uncompleted contracts	$	102,088	$	79,235
Estimated earnings		55,882		44,035
Total		157,970		123,270
Less: Billings to date		144,506		121,464
Net under (over) billings	$	13,464	$	1,806

Schedule of Net Under (Over) Billings

Net under (over) billings were as follows as of March 31 and December 31 (in thousands):

	2018			2017
Costs and estimated earnings in excess of billings on uncompleted contracts (contract assets)	$	18,101		$	6,182
Billings in excess of costs and estimated earnings on uncompleted contracts (contract liabilities)		(4,637	)		(4,376	)
Net under (over) billings	$	13,464		$	1,806