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ACCOUNTS RECEIVABLE AND CONTRACT ASSETS (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
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