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RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE (Tables)
 6 Months Ended
Jun. 30, 2021
Receivables [Abstract]  
Summary of receivable Receivables
(in thousands)
June 30, 2021December 31, 2020
Accounts receivable$166,226 $215,827 
Unbilled receivables236,451 207,155 
Long-term unbilled receivables144,065 113,278 
$546,742 $536,260 
Summary of unbilled receivables Unbilled receivables by expected billing date:
(Dollars in thousands)
June 30, 2021
1 year or less$236,451 62 %
1-2 years88,350 23 %
2-5 years55,715 15 %
$380,516 100 %
Summary of unbilled receivables based upon contract effective date Unbilled receivables by contract effective date:
(Dollars in thousands)
June 30, 2021
2021$140,395 37 %
2020131,618 34 %
201955,282 15 %
201826,688 7 %
2017 and prior26,533 7 %
$380,516 100 %
Schedules of concentration of risk, by risk factor
Clients accounting for 10% or more of the Company’s total receivables:
June 30, 2021December 31, 2020
Client A13 %*
* Client accounted for less than 10% of total receivables.
Clients accounting for 10% or more of the Company’s total revenue:
Three Months Ended
June 30,		Six Months Ended
June 30,
(Dollars in thousands)2021202020212020
Total revenue$325,702 $227,375 $639,201 $492,966 
Client A13 %***
*Client accounted for less than 10% of total revenue.
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)
June 30, 2021December 31, 2020
Contract assets (1)
$14,031 $15,296 
Long-term contract assets (2)
10,097 7,777 
$24,128 $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)
June 30, 2021December 31, 2020
Deferred revenue$242,194 $232,865 
Long-term deferred revenue (1)
6,041 8,991 
$248,235 $241,856 
(1) Included in other long-term liabilities.