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Revenue Recognition (Tables)
 3 Months Ended
Mar. 29, 2019
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 29, 2019
 
December 31, 2018
 
$ change
 
% change
Accounts receivable, trade
 
$
138,498

 
$
124,498

 
$
14,000

 
11
 %
Unbilled receivables
 
6,027

 
4,619

 
1,408

 
30
 %
Unearned revenue
 
5,194

 
5,918

 
(724
)
 
(12
)%