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Other Non-Current Liabilities (Tables)
 9 Months Ended
Sep. 30, 2021
Liabilities, Noncurrent [Abstract]  
Summary of Other Non-Current Liabilities
Other non-current liabilities consist of the following:
As of
September 30, 2021December 31, 2020
Retirement benefits$6,073 $8,940 
Derivative instruments2,504 29 
Unrecognized tax benefits907 907 
Deferred transition revenue509 924 
Finance lease liabilities254 281 
Accrued capital expenditures— 3,486 
Others3,282 3,568 
Other non-current liabilities$13,529 $18,135