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Accounts Receivable, net (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Receivables [Abstract]    
Contracts in progress $ 183,584 $ 167,809
Trade receivables 102,129 106,937
Unbilled retentions 65,597 50,957
Other receivables 3,780 476
Allowance for doubtful accounts (4,226) (3,733)
Total accounts receivable, net $ 350,864 $ 322,446