Revenue (Tables)

3 Months Ended

Mar. 31, 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 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