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Revenue from Contracts with Customers
 3 Months Ended
Mar. 31, 2022
Revenue from Contract with Customer [Abstract]  
Revenue from Contracts with Customers Revenue from Contracts with Customers
Disaggregation of Revenue
The following table summarizes revenue:
Three Months Ended
(in thousands, except percentages)March 31,
2022		March 31,
2021
Revenue:
Subscription lease licenses$91,457 $65,077 
Perpetual licenses65,988 67,527 
Software licenses157,445 132,604 
Maintenance247,241 213,674 
Service20,391 16,948 
Maintenance and service267,632 230,622 
Total revenue$425,077 $363,226 
Direct revenue, as a percentage of total revenue72.4 %71.8 %
Indirect revenue, as a percentage of total revenue27.6 %28.2 %

Our software license revenue is recognized up front, while maintenance and service revenue is generally recognized over the term of the contract.
Deferred Revenue
Deferred revenue consists of billings made or payments received in advance of revenue recognition from customer agreements. The timing of revenue recognition may differ from the timing of billings to customers. Payment terms vary by the type and location of customer and the products or services offered. The time between invoicing and when payment is due is not significant.
The changes in deferred revenue, inclusive of both current and long-term deferred revenue, during the three months ended March 31, 2022 and 2021 were as follows:
(in thousands)20222021
Beginning balance – January 1$412,781 $388,810 
Acquired deferred revenue84 — 
Deferral of revenue423,649 362,043 
Recognition of revenue(425,077)(363,226)
Currency translation(6,317)(6,898)
Ending balance – March 31$405,120 $380,729 

Total revenue allocated to remaining performance obligations as of March 31, 2022 will be recognized as revenue as follows:
(in thousands) 
Next 12 months$746,037 
Months 13-24251,667 
Months 25-36139,907 
Thereafter65,564 
Total revenue allocated to remaining performance obligations$1,203,175 

Revenue allocated to remaining performance obligations represents contracted revenue that has not yet been recognized, which includes both deferred revenue and backlog. Our backlog represents installment billings for periods beyond the current quarterly billing cycle. Revenue recognized during the three months ended March 31, 2022 and 2021 included amounts in deferred revenue and backlog at the beginning of the period of $244.6 million and $209.3 million, respectively.