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New Accounting Standards Implemented - Schedule of Contract Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jan. 02, 2018
Dec. 31, 2017
Accounting Changes and Error Corrections [Abstract]      
Unbilled contract receivables, gross $ 20,808 $ 15,245  
Retainage 30,559 30,223  
Total contract assets 51,367 45,468  
Less: current portion 45,836 45,468
Contract assets non-current $ 5,531