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Equity- Valuation Assumptions (Details) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Equity [Abstract]      
Risk-free interest rate 1.51% 1.08% 1.23%
Expected life in years 5 years 5 years 5 years
Expected volatility 24.00% 24.00% 27.00%
Expected dividend yield 1.00% 1.00% 1.00%
Estimated fair value of options granted per share $ 9.88 $ 8.19 $ 9.05