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Share-based Compensation and Other Employment Benefit Plans (Market Restricted Share Units and Performance Share Units) (Details) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Market Restricted Share Units      
Share Units      
Outstanding, Beginning of Period (in shares) 171,563 182,409 158,248
Granted (in shares) 57,851 78,174 93,913
Dividend equivalents granted (in shares) 3,204 2,811 3,095
Quantity change by TSR factor (in shares) 17,882 22,182 9,970
Vested (in shares) (105,459) (114,013) (82,817)
Forfeited (in shares) (952)    
Outstanding, End of Period (in shares) 144,089 171,563 182,409
Weighted-Average Grant Date Fair Value      
Outstanding, Beginning of Period, Weighted-Average Grant-date Fair Value (in dollars per share) $ 35.24 $ 27.25 $ 27.02
Granted, Weighted-Average Grant-date Fair Value (in dollars per share) 48.46 43.52 26.93
Dividend equivalents granted, Weighted-Average Grant-date Fair Value (in dollars per share) 41.91 43.52 26.93
Quantity change by TSR factor, Weighted-Average Grant-date Fair Value (in dollars per share) 33.21 27.25 26.93
Vested, Weighted-Average Grant-date Fair Value (in dollars per share) 33.21 26.78 26.40
Forfeited, Weighted-Average Grant-date Fair Value (in dollars per share) 38.32    
Outstanding, End of Period, Weighted-Average Grant-date Fair Value (in dollars per share) $ 41.91 $ 35.24 $ 27.25
Performance Share Units      
Share Units      
Outstanding, Beginning of Period (in shares) 244,541 238,480 151,567
Granted (in shares) 86,774 72,825 83,529
Dividend equivalents granted (in shares) 4,418 2,562 3,384
Vested (in shares) (84,326) (69,326)  
Adjustment for performance (in shares) (1,250)    
Forfeited (in shares) (1,900)    
Outstanding, End of Period (in shares) 248,257 244,541 238,480
Weighted-Average Grant Date Fair Value      
Outstanding, Beginning of Period, Weighted-Average Grant-date Fair Value (in dollars per share) $ 31.54 $ 25.99 $ 26.01
Granted, Weighted-Average Grant-date Fair Value (in dollars per share) 47.23 41.61 25.95
Dividend equivalents granted, Weighted-Average Grant-date Fair Value (in dollars per share) 28.06 41.61 25.95
Vested, Weighted-Average Grant-date Fair Value (in dollars per share) 28.06 23.47  
Adjustment for performance, Weighted-Average Grant-date Fair Value (in dollars per share) 28.06    
Forfeited, Weighted-Average Grant-date Fair Value (in dollars per share) 33.52    
Outstanding, End of Period, Weighted-Average Grant-date Fair Value (in dollars per share) $ 38.29 $ 31.54 $ 25.99