Annual report pursuant to Section 13 and 15(d)

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

v3.3.1.900
Stock-Based Compensation (Schedule of Weighted Average Assumptions) (Details) - Stock Options [Member] - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term, years 4 years 7 months 5 days 4 years 8 months 8 days 4 years 8 months 12 days
Expected stock price volatility 26.57% 27.62% 30.53%
Risk-free interest rate 1.20% 1.22% 0.71%
Expected dividend yield 1.26% 1.34% 1.62%
Weighted average grant date fair value $ 10.36 $ 8.69 $ 6.18