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ACCOUNTS RECEIVABLE AND CONTRACT ASSETS (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
ACCOUNTS RECEIVABLE AND CONTRACT ASSETS    
Accounts receivable $ 45,531 $ 45,499
Contract assets 18,639 21,825
Receivables from related parties 174 149
Accounts receivable and contract assets, net $ 64,344 $ 67,473