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Share-Based Compensation (Market Restricted Share Units and Performance Share Units) (Details) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Market Restricted Stock Units (MRSUs) [Member]      
Share Units      
Outstanding, Beginning of Period (in shares) 158,248 118,186 40,512
Share unit rounding due to reverse stock split on May 16, 2014 (in shares)     4
Granted (in shares) 93,913 82,152 90,117
Dividend equivalents granted (in shares) 3,095 2,221 1,231
Quantity change by TSR factor (in shares) 9,970 4,838 1,518
Vested (in shares) (82,817) (49,149) (15,196)
Outstanding, End of Period (in shares) 182,409 158,248 118,186
Weighted-Average grant date Fair Value      
Outstanding, Beginning of Period, Weighted-Average Grant-date Fair Value (in dollars per share) $ 27.02 $ 24.33 $ 24.43
Share unit rounding due to reverse stock split on May 16, 2014, Weighted-Average Grant-date Fair Value (in dollars per share)     24.43
Granted, Weighted-Average Grant-date Fair Value (in dollars per share) 26.93 29.39 24.30
Dividend equivalents granted, Weighted-Average Grant-date Fair Value (in dollars per share) 26.93 29.05 24.09
Quantity change by TSR factor, Weighted-Average Grant-date Fair Value (in dollars per share) 26.93 24.33 24.43
Vested, Weighted-Average Grant-date Fair Value (in dollars per share) 26.40 24.34 24.43
Outstanding, End of Period, Weighted-Average Grant-date Fair Value (in dollars per share) $ 27.25 $ 27.02 $ 24.33
Performance Share Units (PSUs) [Member]      
Share Units      
Outstanding, Beginning of Period (in shares) 151,567 67,675 0
Granted (in shares) 83,529 82,152 67,157
Dividend equivalents granted (in shares) 3,384 1,740 518
Outstanding, End of Period (in shares) 238,480 151,567 67,675
Weighted-Average grant date Fair Value      
Outstanding, Beginning of Period, Weighted-Average Grant-date Fair Value (in dollars per share) $ 26.01 $ 23.47 $ 0.00
Granted, Weighted-Average Grant-date Fair Value (in dollars per share) 25.95 28.06 23.47
Dividend equivalents granted, Weighted-Average Grant-date Fair Value (in dollars per share) 25.95 28.06 24.09
Outstanding, End of Period, Weighted-Average Grant-date Fair Value (in dollars per share) $ 25.99 $ 26.01 $ 23.47