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Restructuring Costs (Restructuring Activities) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 29, 2018
 [1]
Jun. 30, 2018
 [1]
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
 [1]
Jul. 01, 2017
 [1]
Apr. 01, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restructuring Charges [Abstract]                      
Restructuring reserve, beginning balance       $ 254         $ 254    
Restructuring costs $ 0 [1] $ 228 $ 61 0 [1] $ 752 [1] $ 423 $ 315 $ 554 [1] 289 $ 2,044 $ 2,666
Restructuring reserve, ending balance 159       254       159 254  
Employee Severance                      
Restructuring Charges [Abstract]                      
Restructuring reserve, beginning balance       $ 254       $ 1,333 254 1,333 2,827
Restructuring costs                 289 2,044 2,666
Cash payments                 (384) (3,122) (4,152)
Foreign currency translation                 0 (1) (8)
Restructuring reserve, ending balance $ 159       $ 254       $ 159 $ 254 $ 1,333
[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.