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Trade accounts receivable, unbilled services and payments on account (Tables)
 6 Months Ended
Jun. 30, 2018
Contracts Receivable [Abstract]  
Schedule of Contracts with Customers, Asset and Liabilities

Trade accounts receivables and unbilled revenue are as follows:
 
June 30, 2018

 
December 31, 2017

 
(in thousands)
Contract assets:
 
 
 
Billed services (accounts receivable)
$
412,933


$
388,431

Unbilled services (unbilled revenue)
274,501


268,509

Trade accounts receivable and unbilled revenue
687,434


656,940

Allowance for doubtful accounts
(8,361
)

(8,930
)
 
 
 
 
Trade accounts receivable and unbilled revenue, net
$
679,073


$
648,010


Unbilled services and payments on account were as follows:
(in thousands, except percentages)
June 30, 2018

 
December 31, 2017

 
$ Change
 
% Change
 
 
 
 
 
 
Unbilled services (unbilled revenue)
$
274,501

 
$
268,509

 
$
5,992

 
2.2
 %
Unearned revenue (payments on account)
(326,741
)
 
(298,992
)
 
(27,749
)
 
9.3
 %
 
 
 
 
 
 
 
 
Net balance
$
(52,240
)
 
$
(30,483
)
 
$
(21,757
)
 
(71.4
)%