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Stockholders' Equity (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 28, 2020
Mar. 29, 2020
Sep. 29, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 27, 2020
Sep. 29, 2019
Stockholders Equity Note [Abstract]              
Shares remaining authorized for repurchase (in shares)           2,700,000  
Stock repurchased (in shares)           900,000 1,700,000
Cost of stock repurchased $ 7,500 $ 15,008 $ 21,966 $ 16,980 $ 15,000 $ 22,500 $ 53,900
RSU withholdings (in shares)           188,000 180,000
RSU withholdings           $ 4,750 $ 6,058