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Contract Assets, Contract Costs and Contract Liabilities (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 29, 2018
Jun. 29, 2018
Jan. 01, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]        
Contract assets $ 125,204,000 $ 125,204,000 $ 82,699,000 $ 0
Contract assets, change   $ 42,505,000    
Contract assets, change (as percent)   51.40%    
Contract costs, current portion 3,487,000 $ 3,487,000 3,022,000 0
Capitalized costs, current portion, change   $ 465,000    
Capitalized costs, current portion, change (as percent)   15.40%    
Contract costs, noncurrent portion 12,847,000 $ 12,847,000 7,852,000 0
Capitalized costs, noncurrent portion, change   $ 4,995,000    
Capitalized costs, noncurrent portion, change (as percent)   63.60%    
Contract liabilities, current portion 9,928,000 $ 9,928,000 10,705,000 0
Contract liabilities, current portion, change   $ (777,000)    
Contract liabilities, current portion, change (as percent)   (7.30%)    
Contract liabilities, noncurrent portion 76,330,000 $ 76,330,000 689,000 0
Contract liabilities, noncurrent portion, change   $ 75,641,000    
Contract liabilities, noncurrent portion, change (as percent)   10978.40%    
Impairment loss   $ 0    
Capitalized contract cost, amortization 1,000,000 1,700,000    
Revenue recognized related to contract liabilities 1,400,000 6,400,000    
Claims [Member]        
Disaggregation of Revenue [Line Items]        
Contract with Customer, Asset, Net     4,300,000  
Contract changes, negotiated settlements and claims for unanticipated contract costs        
Disaggregation of Revenue [Line Items]        
Contract assets 3,423,000 3,423,000   $ 0
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09        
Disaggregation of Revenue [Line Items]        
Contract assets (125,204,000) (125,204,000) 82,699,000  
Contract costs, current portion (3,487,000) (3,487,000) 3,022,000  
Contract costs, noncurrent portion (12,847,000) (12,847,000) 7,852,000  
Contract liabilities, current portion (9,928,000) (9,928,000) 10,705,000  
Contract liabilities, noncurrent portion $ (76,330,000) $ (76,330,000) $ 689,000