Revenue (Tables)

9 Months Ended

Sep. 30, 2020

Revenue from Contract with Customer [Abstract]

Contract with Customer, Asset and Liability

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 September 30, 2020 and December 31, 2019, respectively,

and revenue recognized during the nine months ended September 30, 2020 and 2019, respectively, that was in billings in excess of cost and unearned revenue at the beginning of the period (in thousands):

	September 30, 2020		December 31, 2019
Costs in excess of billings	$	35,432	$	20,607
Billings in excess of cost	(31,267)		(47,598)
Unearned revenue	(18,951)		(17,311)

	Nine Months Ended September 30, 2020		Nine Months Ended September 30, 2019
Revenue recognized in the period from:
Amounts included in billings in excess of cost at the beginning of the period	$	44,723	$	14,137
Amounts included in unearned revenue at the beginning of the period	$	13,614	$	11,052