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Segment and Geographic Information (Sales by Geographic Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 28, 2018 | Sep. 28, 2018 | Jun. 29, 2018 | Mar. 30, 2018 | Dec. 29, 2017 | Sep. 29, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 28, 2018 | Dec. 29, 2017 | Dec. 30, 2016
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  |  |  |  | 52.00% | 53.00% | 57.00%
Total sales | $ 303,034 | $ 305,088 | $ 314,464 | $ 292,426 | $ 302,260 | $ 286,168 | $ 280,916 | $ 266,736 | $ 1,215,012 | $ 1,136,080 | $ 1,075,502
UNITED STATES [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  | 687,259 | 662,133 | 625,670
PUERTO RICO [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  | 146,500 | 140,184 | 162,343
Rest Of World [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  | 319,209 | 278,399 | 233,988
COSTA RICA |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  | $ 62,044 | $ 55,364 | $ 53,501

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