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Other Assets
 12 Months Ended
Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other Assets Other Assets
Other assets consist of the following:
As of December 31,
20202021
Contract asset (Note 25)$6,770 $5,235 
Advance income and non-income taxes155,035 124,219 
Deposits 32,058 28,463 
Derivative instruments6,164 14,876 
Prepaid expenses 5,176 5,979 
Deferred billings, net*25,357 44,360 
Right of use (ROU) assets finance lease50,083 34,284 
Others43,175 64,742 
Total$323,818 $322,158 
*Deferred billings were $28,491 and $48,071 and allowances for credit losses on deferred billings were $3,134 and $3,711, resulting in net deferred billings balances of $25,357 and $44,360 as of December 31, 2020 and 2021, respectively.
Total credit losses on deferred billings of $3,134 as of December 31, 2020 includes $734 as a transition date adjustment through retained earnings pursuant to the adoption of ASC 326 and $2,400 as a charge for the year ended December 31, 2020. During the year ended December 31, 2021, the Company recorded an additional charge of $577 to cost and expense on account of credit losses on deferred billings.