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Trade Accounts Receivable, Unbilled Services (Contract Assets) and Payments on Account (Contract Liabilities) (Tables)
 12 Months Ended
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]  
Schedule of Contracts with Customers, Asset and Liabilities
Trade accounts receivables and unbilled revenue are as follows:
 
December 31, 2018

 
December 31, 2017

 
(in thousands)
 
 
 
 
Billed services (accounts receivable)
$
423,680

 
$
388,431

Unbilled services (unbilled revenue)
362,926

 
268,509

Trade accounts receivable and unbilled revenue
786,606

 
656,940

Allowance for doubtful accounts (note 18)
(8,889
)
 
(8,930
)
 
 
 
 
Trade accounts receivable and unbilled revenue, net
$
777,717

 
$
648,010


Unbilled services and payments on account (contract assets and liabilities) were as follows:
(in thousands, except percentages)
December 31, 2018

 
December 31, 2017

 
$ Change
 
% Change
 
 
 
 
 
 
Unbilled services (unbilled revenue)
$
362,926

 
$
268,509

 
$
94,417

 
35.2
 %
Unearned revenue (payments on account)
(274,468
)
 
(298,992
)
 
24,524

 
(8.2
)%
 
 
 
 
 
 
 
 
Net balance
$
88,458

 
$
(30,483
)
 
$
118,941

 
390.2
 %