Revenue (Tables)

6 Months Ended

Jun. 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 June 30, 2020 and December 31, 2019, respectively, and

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

	June 30, 2020		December 31, 2019
Costs in excess of billings	$	24,627	$	20,607
Billings in excess of cost	(29,281)		(47,598)
Unearned revenue	(16,503)		(17,311)

	Six Months Ended June 30, 2020		Six Months Ended June 30, 2019
Revenue recognized in the period from:
Amounts included in billings in excess of cost at the beginning of the period	$	42,115	$	11,357
Amounts included in unearned revenue at the beginning of the period	$	12,553	$	6,153