Costs And Estimated Earnings In Excess Of Billings (Tables)

6 Months Ended

Jun. 30, 2017

Costs and estimated earnings in excess of billings [Abstract]

Costs And Estimated Earnings In Excess Of Billings

	As of June 30,		As of December 31,
(in thousands)	2017		2016
Claims	$	486,067	$	477,425
Unapproved change orders		263,130		207,475
Other unbilled costs and profits		101,437		146,926
Total costs and estimated earnings in excess of billings	$	850,634	$	831,826