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Earnings Per Common Share and Share Awards Share-Based Assumptions (Details)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share [Abstract]      
Expected Life (in years) 7 years 7 years 6 years 10 months 24 days
Volatility 28.90% 40.70% 39.90%
Interest Rate 1.70% 2.00% 2.10%
Yield Rate 1.00% 0.40% 0.40%