Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Summary of Stock-Based Compensation Activity - Stock Options) (Details)

v3.10.0.1
Stock-Based Compensation (Summary of Stock-Based Compensation Activity - Stock Options) (Details)
$ / shares in Units, $ in Thousands
6 Months Ended
Jul. 01, 2018
USD ($)
$ / shares
shares
Shares  
Outstanding at December 31, 2017 | shares 274,110
Exercised | shares (23,168)
Forfeited | shares (936)
Outstanding at July 1, 2018 | shares 250,006
Exercisable at July 1, 2018 | shares 248,150
Weighted Average Exercise Price  
Outstanding at December 31, 2017 | $ / shares $ 19.54
Exercised | $ / shares 17.82
Forfeited | $ / shares 32.02
Outstanding at July 1, 2018 | $ / shares 19.65
Exercisable at July 1, 2018 | $ / shares $ 19.57
Weighted Average Remaining Contractual Term (Years)  
Outstanding at July 1, 2018 3 years 8 months 9 days
Exercisable at July 1, 2018 3 years 8 months 1 day
Aggregate Intrinsic Value  
Outstanding at July 1, 2018 | $ $ 2,789
Exercisable at July 1, 2018 | $ $ 2,784