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Revenue From Contracts With Customers - Net Excess Billings (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]    
Costs and estimated earnings in excess of billings on uncompleted contracts $ 44,133 $ 41,542
Billings in excess of costs and estimated earnings on uncompleted contracts (55,598) (62,407)
Net amount of billings in excess of costs and estimated earnings on uncompleted contracts $ (11,465) $ (20,865)