Costs And Estimated Earnings In Excess Of Billings (Tables)

9 Months Ended

Sep. 30, 2017

Costs and estimated earnings in excess of billings [Abstract]

Costs And Estimated Earnings In Excess Of Billings

	As of September 30,		As of December 31,
(in thousands)	2017		2016
Claims	$	505,069	$	477,425
Unapproved change orders		295,204		207,475
Other unbilled costs and profits		102,039		146,926
Total costs and estimated earnings in excess of billings	$	902,312	$	831,826