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Revenue From Contracts With Customers - Net Excess Billings (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Revenue from Contract with Customer [Abstract]    
Costs and estimated earnings in excess of billings on uncompleted contracts $ 36,388 $ 37,112
Billings in excess of costs and estimated earnings on uncompleted contracts (58,304) (62,374)
Net amount of costs and estimated earnings on uncompleted contracts below billings $ (21,916) $ (25,262)