Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Schedule of Weighted Average Assumptions for Restricted Stock Units) (Details)

v3.10.0.1
Stock-Based Compensation (Schedule of Weighted Average Assumptions for Restricted Stock Units) (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years 9 months 8 days 3 years 10 months 15 days 3 years 6 months 26 days
Expected dividend yield 1.15% 1.30% 1.08%
Estimated average fair value per restricted stock unit granted $ 73.74 $ 52.45 $ 55.93