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Contracts - Schedule of Costs Estimated Earnings and Billings on Uncompleted Contracts (Details) - USD ($)
$ in Thousands
Sep. 24, 2016
Dec. 26, 2015
Contractors [Abstract]    
Costs incurred on uncompleted contracts $ 56,512 $ 67,488
Estimated earnings on uncompleted contracts 23,853 27,492
Earned revenues 80,365 94,980
Less: billings to date 80,349 94,830
Net costs and estimated earnings in excess of billings on uncompleted contracts 16 150
Costs and estimated earnings in excess of billings on uncompleted contracts 2,152 4,062
Billings in excess of costs and estimated earnings on uncompleted contracts (2,136) (3,912)
Net costs and estimated earnings in excess of billings on uncompleted contracts $ 16 $ 150