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ACCOUNTS RECEIVABLE (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Contract receivables [Abstract]    
Contracts in progress $ 129,326 $ 105,071
Unbilled retentions 33,347 32,850
Trade receivables 53,433 16,202
Other receivables 266 195
Allowance for doubtful accounts (2,345) (2,760)
Total accounts receivable $ 214,027 $ 151,558