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Other Non-Current liabilities (Tables)
 12 Months Ended
Dec. 31, 2021
Liabilities, Noncurrent [Abstract]  
Summary of Other Non-Current Liabilities
Other non-current liabilities consist of the following:
As of
December 31, 2021December 31, 2020
Retirement benefits$9,604 $8,940 
Contingent consideration9,000 — 
Derivative instruments1,785 29 
Deferred transition revenue995 924 
Unrecognized tax benefits1,068 907 
Finance lease liabilities229 281 
Accrued capital expenditures— 3,486 
Others120 3,568 
Other non-current liabilities$22,801 $18,135