Contract Assets (Tables)

6 Months Ended

Jun. 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:

	Six Months Ended
	June 30,
(in thousands)		2019		2018
Beginning balance as of December 31,	$	140,082	$	146,496
Revenue recognized		1,109,396		1,179,105
Amounts collected or invoiced	(1,093,932)		(1,177,370)
Ending balance as of June 30,	$	155,546	$	148,231