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Revenue - Revenue by Contract Relationship (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 30, 2018
Mar. 31, 2017
Disaggregation of Revenue [Line Items]    
Total revenue $ 320,516 $ 290,063
Prime contractor    
Disaggregation of Revenue [Line Items]    
Total revenue 301,028 285,033
Subcontractor    
Disaggregation of Revenue [Line Items]    
Total revenue $ 19,488 $ 5,030