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Revenue Recognition - Contract Balances from Contracts with Customers (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 29, 2018
Revenue recognized in the period from:    
Amounts included in contract liabilities at the beginning of the period $ 1,505 $ 6,022
Performance obligations satisfied in previous periods $ 3,442 $ 8,834