Annual report pursuant to Section 13 and 15(d)

Contract Revenue and Percentage-of-Completion Method - Uncompleted Contracts Included in Accompanying Consolidated Balance Sheets (Details)

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Contract Revenue and Percentage-of-Completion Method - Uncompleted Contracts Included in Accompanying Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Revenue Recognition [Abstract]    
Contracts in progress $ 26,829 $ 12,822
Advance billings on contracts (3,977) (7,081)
Net costs and estimated earnings in excess of billings $ 22,852 $ 5,741