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RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE (Tables)
 3 Months Ended
Mar. 31, 2021
Receivables [Abstract]  
Summary of receivable
Receivables
(in thousands)
March 31, 2021December 31, 2020
Accounts receivable$159,324 $215,827 
Unbilled receivables228,603 207,155 
Long-term unbilled receivables108,048 113,278 
$495,975 $536,260 
Summary of unbilled receivables
(Dollars in thousands)
March 31, 2021
1 year or less$228,603 68 %
1-2 years80,688 24 %
2-5 years27,360 8 %
$336,651 100 %
Summary of unbilled receivables based upon contract effective date
(Dollars in thousands)
March 31, 2021
2021$46,625 14 %
2020163,226 48 %
201963,600 19 %
201828,885 9 %
2017 and prior34,315 10 %
$336,651 100 %
Summary of contract assets and deferred revenue
Contract assets
Contract assets are client-committed amounts for which revenue recognized exceeds the amount billed to the client, and billing is subject to conditions other than the passage of time, such as completing a related performance obligation.
(in thousands)
March 31, 2021December 31, 2020
Contract assets (1)
$13,454 $15,296 
Long-term contract assets (2)
7,284 7,777 
$20,738 $23,073 
(1) Included in other current assets. (2) Included in other long-term assets.
Deferred revenue
Deferred revenue consists of billings and payments received in advance of revenue recognition.
(in thousands)
March 31, 2021December 31, 2020
Deferred revenue$244,170 $232,865 
Long-term deferred revenue (1)
7,565 8,991 
$251,735 $241,856 
(1) Included in other long-term liabilities.