Costs and estimated earnings in excess of billings (Tables)

3 Months Ended

Mar. 31, 2016

Costs and estimated earnings in excess of billings [Abstract]

Costs and estimated earnings in excess of billings

	March 31,		December 31,
(in thousands)	2016		2015
Claims	$	395,708	$	407,164
Unapproved change orders		224,297		270,019
Other unbilled costs and profits		238,351		227,992
Total costs and estimated earnings in excess of billings	$	858,356	$	905,175