Contract Assets (Tables)

3 Months Ended

Mar. 31, 2019

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)		2019		2018
Beginning balance as of December 31,	$	140,082	$	146,496
Revenue recognized		564,889		561,998
Amounts collected or invoiced		(547,946)		(560,871)
Ending balance as of March 31,	$	157,025	$	147,623