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ACCOUNTS RECEIVABLE AND CONTRACT ASSETS (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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ACCOUNTS RECEIVABLE AND CONTRACT ASSETS |  |
Accounts receivable | $ 48,416 | $ 52,935
Contract assets | 28,529 | 22,878
Receivables from related parties | 131 | 121
Accounts receivable and contract assets, net | $ 77,076 | $ 75,934

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