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Revenue Recognition (Tables)
 3 Months Ended
Mar. 27, 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)
 
March 27, 2020
 
December 31, 2019
 
$ change
 
% change
Accounts receivable, trade
 
$
129,139

 
$
141,168

 
$
(12,029
)
 
(9
)%
Unbilled receivables
 
9,265

 
13,583

 
(4,318
)
 
(32
)%
Unearned revenue
 
2,317

 
3,380

 
(1,063
)
 
(31
)%