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ACCOUNTS RECEIVABLE AND CONTRACT ASSETS (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
ACCOUNTS RECEIVABLE AND CONTRACT ASSETS
Accounts receivable	$ 45,499	$ 48,416
Contract assets	21,825	28,529
Receivables from related parties	149	131
Accounts receivable and contract assets, net	$ 67,473	$ 77,076

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