Contract Assets (Tables)

6 Months Ended

Jun. 30, 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:

	Six Months Ended
	June 30,
(in thousands)		2018		2017
Transferred to receivables from contract assets recognized at
the beginning of the period	$	(290,599)	$	(305,850)
Contract assets recognized, net of reclassification to accounts receivable		292,334		302,384
Net change	$	1,735	$	(3,466)