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Restructuring Costs (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
[1]
Sep. 29, 2018
[1]
Jun. 30, 2018
[1]
Mar. 31, 2018
[1]
Dec. 31, 2017
[1]
Sep. 30, 2017
[1]
Jul. 01, 2017
[1]
Apr. 01, 2017
[1]
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]                      
Restructuring costs $ 0 $ 228 $ 61 $ 0 $ 752 $ 423 $ 315 $ 554 $ 289 $ 2,044 $ 2,666
Employee Severance                      
Restructuring Cost and Reserve [Line Items]                      
Restructuring costs                 $ 289 $ 2,044 $ 2,666
[1] The Company reports interim financial information for the 13-week periods beginning on a Sunday and ending on a Saturday, except for the first fiscal quarter, which always begins on January 1, and the fourth fiscal quarter, which always ends on December 31. The first, second, third, and fourth quarters of 2018 ended on March 31, June 30, September 29, and December 31, respectively. The first, second, third, and fourth quarters of 2017 ended on April 1, July 1, September 30, and December 31, respectively.