Costs and estimated earnings in excess of billings (Tables)

3 Months Ended

Mar. 31, 2017

Costs and estimated earnings in excess of billings [Abstract]

Costs And Estimated Earnings In Excess Of Billings

	As of March 31,		As of December 31,
(in thousands)	2017		2016
Claims	$	464,220	$	477,425
Unapproved change orders		250,114		207,475
Other unbilled costs and profits		126,426		146,926
Total costs and estimated earnings in excess of billings	$	840,760	$	831,826