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RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE (Tables)
 12 Months Ended
Dec. 31, 2019
Receivables [Abstract]  
Summary of Accounts Receivable and Unbilled Receivable
Receivables
(in thousands)
December 31, 2019
 
December 31, 2018
Accounts receivable
$
199,720

 
$
180,872

Unbilled receivables
180,219

 
172,656

Long-term unbilled receivables
121,736

 
151,237

 
$
501,675

 
$
504,765
Summary of Unbilled Receivables
Unbilled receivables are expected to be billed in the future as follows:
(Dollars in thousands)
December 31, 2019
1 year or less
$
180,219

60
%
1-2 years
91,132

30
%
2-5 years
30,604

10
%
 
$
301,955

100
%
Summary of Contract Assets and Deferred Revenue
Contract assets and deferred revenue
(in thousands)
December 31, 2019
 
December 31, 2018
Contract assets (1)
$
5,558

 
$
3,711

Long-term contract assets (2)
5,420

 
2,543

 
$
10,978

 
$
6,254

Deferred revenue
$
190,080

 
$
185,145

Long-term deferred revenue (3)
5,407

 
5,344

 
$
195,487

 
$
190,489

(1) Included in other current assets. (2) Included in other long-term assets. (3) Included in other long-term liabilities.