Annual report pursuant to Section 13 and 15(d)

Stock Incentive Plans - Summary of Options (Details)

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Stock Incentive Plans - Summary of Options (Details) - Stock Options
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Shares  
Outstanding, beginning of period (in shares) | shares 408
Granted (in shares) | shares 145
Forfeited/expired (in shares) | shares (20)
Exercised (in shares) | shares (64)
Outstanding, end of period (in shares) | shares 469
Vested and expected to vest as of December 25, 2016 (in shares) | shares 427
Exercisable as of December 25, 2016 (in shares) | shares 200
Weighted Average Exercise Price  
Outstanding, beginning of period (in dollars per share) | $ / shares $ 53.82
Granted (in dollars per share) | $ / shares 48.07
Forfeited/expired (in dollars per share) | $ / shares 53.32
Exercised (in dollars per share) | $ / shares 35.36
Outstanding, end of period (in dollars per share) | $ / shares 54.60
Weighted Average Exercise Price, Vested and expected to vest as of December 25, 2016 (in dollars per share) | $ / shares 54.89
Weighted Average Exercise Price, Exercisable as of December 25, 2016 (in dollars per share) | $ / shares $ 51.99
Weighted Average Remaining Years of Contractual Life, Outstanding as of December 25, 2016 7 years 2 months 27 days
Weighted Average Remaining Years of Contractual Life, Vested and expected to vest as of December 25, 2016 7 years 29 days
Weighted Average Remaining Years of Contractual Life, Exercisable as of December 25, 2016 5 years 6 months 11 days
Aggregate Intrinsic Value, Outstanding as of December 25, 2016 | $ $ 3,550
Aggregate Intrinsic Value, Vested and expected to vest as of December 25, 2016 | $ 3,267
Aggregate Intrinsic Value, Exercisable as of December 25, 2016 | $ $ 2,250