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Stock-Based Compensation - Stock Option Activity (Details)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 28, 2019
USD ($)
$ / shares
shares
Shares  
Options outstanding at beginning of period (in shares) | shares 22,674,062
Granted (in shares) | shares 801,166
Exercised (in shares) | shares (2,147,426)
Forfeited (in shares) | shares (88,105)
Expired (in shares) | shares (29,278)
Options outstanding at end of period (in shares) | shares 21,210,419
Exercisable at end of period (in shares) | shares 15,670,941
Weighted Average Exercise Price Per Share  
Options outstanding at beginning of period (in dollars per share) | $ / shares $ 8.71
Granted (in dollars per share) | $ / shares 21.10
Exercised (in dollars per share) | $ / shares 4.93
Forfeited (in dollars per share) | $ / shares 15.32
Expired (in dollars per share) | $ / shares 22.89
Options outstanding at end of period (in dollars per share) | $ / shares 9.52
Exercisable at end of period (in dollars per share) | $ / shares $ 6.36
Weighted Average Remaining Contractual Term  
Options outstanding at end of period 3 years 6 months
Exercisable at end of period 2 years 9 months 18 days
Aggregate Intrinsic Value  
Options outstanding at end of period | $ $ 258,157
Exercisable at end of period | $ $ 237,737