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Stock-based Compensation (Summary of All RSU Activity) (Details) - RSUs [Member]
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 28, 2018
USD ($)
$ / shares
shares
Shares  
Awards outstanding at beginning of period (in shares) | shares 3,762,990
Awarded (in shares) | shares 2,519,425
Vested and released (in shares) | shares (1,081,339)
Forfeited (in shares) | shares (343,742)
Awards outstanding at end of period (in shares) | shares 4,857,334
Weighted Average Grant Date Fair Value  
Awards outstanding at beginning of period (in dollars per share) | $ / shares $ 17.76
Awarded (in dollars per share) | $ / shares 18.46
Vested and released (in dollars per share) | $ / shares 16.05
Forfeited (in dollars per share) | $ / shares 18.99
Awards outstanding at end of period (in dollars per share) | $ / shares $ 18.42
Weighted Average Remaining Contractual Term, Awards outstanding at December 31, 2018 2 years 1 month 24 days
Aggregate Intrinsic Value, Awards outstanding at December 31, 2018 | $ $ 94,427