Annual report pursuant to Section 13 and 15(d)

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

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Stock-Based Compensation (Schedule of Weighted Average Assumptions) (Details) - Stock Options [Member] - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term, years 4 years 6 months 4 years 6 months 4 years 6 months 14 days
Expected stock price volatility 27.14% 28.39% 28.91%
Risk-free interest rate 2.49% 2.47% 1.73%
Expected dividend yield 1.03% 1.15% 1.29%
Weighted average grant date fair value $ 22.51 $ 18.86 $ 13.11
Vesting period 4 years