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Stock-Based Compensation - Stock Option Activity (Details)
$ / shares in Units, $ in Thousands
 9 Months Ended
Sep. 28, 2018
USD ($)
$ / shares
shares
Shares  
Options outstanding at beginning of period (in shares) | shares 22,208,446
Granted (in shares) | shares 3,022,113
Exercised (in shares) | shares (2,083,457)
Forfeited (in shares) | shares (216,522)
Expired (in shares) | shares (5,548)
Options outstanding at end of period (in shares) | shares 22,925,032
Exercisable at end of period (in shares) | shares 15,896,370
Weighted Average Exercise Price Per Share  
Options outstanding at beginning of period (in dollars per share) | $ / shares $ 6.83
Granted (in dollars per share) | $ / shares 19.52
Exercised (in dollars per share) | $ / shares 5.01
Forfeited (in dollars per share) | $ / shares 14.40
Expired (in dollars per share) | $ / shares 18.62
Options outstanding at end of period (in dollars per share) | $ / shares 8.59
Exercisable at end of period (in dollars per share) | $ / shares $ 5.03
Weighted Average Remaining Contractual Term  
Options outstanding at end of period 3 years 10 months 20 days
Exercisable at end of period 3 years 21 days
Aggregate Intrinsic Value  
Options outstanding at end of period | $ $ 226,821
Exercisable at end of period | $ $ 203,118