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Revenue Recognition (Tables)
 6 Months Ended
Jun. 26, 2020
Revenue from Contract with Customer [Abstract]  
Contract with Customer, Asset and Liability
Contract Balances: The timing of revenue recognition, billings, and cash collections resulted in the following contract assets and contract liabilities:
(Thousands)June 26, 2020December 31, 2019$ change% change
Accounts receivable, trade
$141,465  $141,168  $297  — %
Unbilled receivables
5,218  13,583  (8,365) (62)%
Unearned revenue
3,003  3,380  (377) (11)%