Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.1
Stock-Based Compensation (Summary of Stock-Based Compensation Activity - Stock Options) (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
$ / shares
shares
Shares  
Outstanding at December 30, 2018 | shares 246,831
Exercised | shares (4,687)
Forfeited | shares 0
Outstanding at March 31, 2019 | shares 242,144
Exercisable at March 31, 2019 | shares 241,391
Weighted Average Exercise Price  
Outstanding at December 30, 2018 | $ / shares $ 19.67
Exercised | $ / shares 7.18
Forfeited | $ / shares 0.00
Outstanding at March 31, 2019 | $ / shares 19.91
Exercisable at March 31, 2019 | $ / shares $ 19.88
Weighted Average Remaining Contractual Term (Years)  
Outstanding at March 31, 2019 3 years
Exercisable at March 31, 2019 3 years
Aggregate Intrinsic Value  
Outstanding at March 31, 2019 | $ $ 1,354
Exercisable at March 31, 2019 | $ $ 1,354