Contract Assets (Tables)

9 Months Ended

Sep. 30, 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:

	Nine Months Ended
	September 30,
(in thousands)		2019		2018
Beginning balance as of December 31,	$	140,082	$	146,496
Revenue recognized		1,613,047		1,774,620
Amounts collected or invoiced	(1,592,061)		(1,765,218)
Ending balance as of September 30,	$	161,068	$	155,898