Contract Assets (Tables)

3 Months Ended

Mar. 31, 2018

Contract With Customer Asset And Liability [Abstract]

Changes In Contract Assets

Significant changes in the contract asset balance during the period are as follows:

	Three Months Ended
	March 31,
(in thousands)		2018		2017
Transferred to receivables from contract assets recognized at
the beginning of the period	$	(145,217)	$	(156,206)
Contract assets recognized, net of reclassification to accounts receivable		146,344		149,645
Net change	$	1,127	$	(6,561)