Revenue Revenue

3 Months Ended

Mar. 31, 2020

Revenue from Contract with Customer [Abstract]

Revenue

REVENUE

Sales includes revenue from contracts with customers for designing, engineering, manufacturing and installation of solar racking systems and greenhouse structures; extraction systems; roof and foundation ventilation products; centralized mail systems and electronic package solutions; rain dispersion products and roofing accessories; expanded and perforated metal; perimeter security solutions; expansion joints and structural bearings.

Refer to Note 14 "Segment Information" for additional information related to revenue recognized by timing of transfer of control by reportable segment.

As of March 31, 2020, the Company's remaining performance obligations are part of contracts that have an original expected duration of one year or less.

Contract assets consist of costs in excess of billings. Contract liabilities consist of billings in excess of cost and unearned revenue. The following table presents the beginning and ending balances of costs in excess of billings, billings in excess of cost and unearned revenue as of March 31, 2020 and December 31, 2019, respectively, and

revenue recognized during the three months ended March 31, 2020 and 2019, respectively, that was in billings in excess of cost and unearned revenue at the beginning of the period (in thousands):

	March 31, 2020			December 31, 2019
Costs in excess of billings	$	21,834		$	20,607
Billings in excess of cost	(34,567		)	(47,598		)
Unearned revenue	(19,388		)	(17,311		)

	Three Months Ended March 31, 2020		Three Months Ended March 31, 2019
Revenue recognized in the period from:
Amounts included in billings in excess of cost  at the beginning of the period	$	29,221	$	9,697
Amounts included in unearned revenue  at the beginning of the period	$	9,619	$	4,661