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Revenues, Contract Assets and Contract Liabilities - Schedule of Contract Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]    
Unbilled contract receivables, gross $ 25,625 $ 21,703
Retainage 31,555 31,301
Total contract assets 57,180 53,004
Less: current portion 49,063 46,018
Contract Assets - non-current $ 8,117 $ 6,986