Costs and estimated earnings in excess of billings (Tables)

3 Months Ended

Mar. 31, 2014

Costs and estimated earnings in excess of billings

Costs and estimated earnings in excess of billings

	March 31		December 31,
	2014		2013
	(in thousands)
Unbilled costs and profits incurred to date*	$	291,188	$	204,276
Unapproved change orders	163,921		146,787
Claims	243,314		222,185
	$	698,423	$	573,248

* Represents the excess of contract costs and profits recognized to date on the percentage of completion accounting method over the amount of contract billings to date on certain contracts.