Accounts receivable, unbilled revenue (contract assets) and unearned revenue or payments on account (contract liabilities) (Tables)

6 Months Ended

Jun. 30, 2020

Revenue from Contract with Customer [Abstract]

Schedule of Contracts with Customers, Asset and Liabilities

Accounts receivables and unbilled revenue are as follows:

	June 30, 2020		December 31, 2019
	(in thousands)
Contract assets:
Billed services (accounts receivable)	$	482,349	$	535,088
Unbilled services (unbilled revenue)	410,397		422,769
Accounts receivable and unbilled revenue	892,746		957,857
Allowance for credit losses	(9,329)		—
Allowance for doubtful debts	—		(7,380)
Accounts receivable and unbilled revenue, net	$	883,417	$	950,477

Unbilled services and unearned revenue or payments on account (contract assets and liabilities) were as follows:

(in thousands, except percentages)	June 30, 2020		December 31, 2019		$ Change		% Change
Unbilled services (unbilled revenue)	$	410,397	$	422,769	$	(12,372)	(2.9)	%
Unearned revenue (payments on account)	(393,217)		(366,988)		(26,229)		7.1	%
Net balance	$	17,180	$	55,781	$	(38,601)	(69.2)	%