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ACCOUNTS RECEIVABLE AND CONTRACT ASSETS (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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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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