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Revenue Recognition - Reserves for Variable Consideration and Credit Risk (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Reimbursable expenses $ 12,087 $ 10,648 $ 23,315 $ 19,788
Selling, general and administrative expenses        
Bad debt expense $ 800   $ 1,100