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Share-Based Compensation (Restricted Share Activity) (Details) - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Number of Restricted Shares    
Nonvested balance, beginning 154,998 169,418
Granted 52,540 64,522
Vested (57,441) (78,942)
Forfeited (8,938) 0
Nonvested balance, ending 141,159 154,998
Weighted Average Grant-Date Fair Value    
Nonvested balance, beginning $ 16.97 $ 11.55
Granted 22.45 22.49
Vested 14.36 9.86
Forfeited 15.69 0.00
Nonvested balance, ending $ 20.15 $ 16.97