XML 57 R46.htm IDEA: XBRL DOCUMENT v3.20.2
Revenue From Contracts With Customers - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Disaggregation of Revenue [Line Items]          
Remaining performance obligation expected to be recognized over next twelve months 63.00%   63.00%    
Costs and Estimated Earnings in Excess of Billings          
Disaggregation of Revenue [Line Items]          
Contracts receivable unpaid project contract price $ 8,200   $ 8,200   $ 3,000
Operating income (Loss)          
Disaggregation of Revenue [Line Items]          
Estimated construction gain (loss) before tax $ 2,197 $ 3,500 $ 2,292 $ 3,300