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Stock-Based Compensation - Stock Option Activity (Details)
$ / shares in Units, $ in Thousands
 9 Months Ended
Sep. 27, 2019
USD ($)
$ / shares
shares
Shares  
Options outstanding at beginning of period (in shares) | shares 22,674,062
Granted (in shares) | shares 1,042,286
Exercised (in shares) | shares (3,042,201)
Forfeited (in shares) | shares (160,241)
Expired (in shares) | shares (35,045)
Options outstanding at end of period (in shares) | shares 20,478,861
Exercisable at end of period (in shares) | shares 15,860,131
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 20.81
Exercised (in dollars per share) | $ / shares 4.94
Forfeited (in dollars per share) | $ / shares 16.76
Expired (in dollars per share) | $ / shares 23.41
Options outstanding at end of period (in dollars per share) | $ / shares 9.80
Exercisable at end of period (in dollars per share) | $ / shares $ 7.02
Weighted Average Remaining Contractual Term  
Options outstanding at end of period 3 years 4 months 24 days
Exercisable at end of period 2 years 9 months 18 days
Aggregate Intrinsic Value  
Options outstanding at end of period | $ $ 186,407
Exercisable at end of period | $ $ 181,542