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Revenue From Contracts With Customers - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Disaggregation of Revenue [Line Items]      
Remaining performance obligation expected to be recognized over next twelve months 65.00%    
Costs and Estimated Earnings in Excess of Billings      
Disaggregation of Revenue [Line Items]      
Contracts receivable unpaid project contract price $ 7,100   $ 3,000
Operating income (Loss)      
Disaggregation of Revenue [Line Items]      
Estimated construction gain (loss) before tax $ 95 $ (200)