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Equity-Based Compensation Plans (Schedule of Outstanding Restricted Stock) (Details) - Long-Term Restricted Stock [Member] - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Number of Units:      
Nonvested, beginning 91,790 55,329 50,438
Granted during the period 48,322 65,255 65,618
Vested during the period (28,275) (28,794) (20,117)
Forfeited or expired during the period (8,535) (40,610)
Nonvested, ending 103,302 91,790 55,329
Weighted-Average Grant-Date Fair Value:      
Nonvested, beginning $ 18.65 $ 17.31 $ 11.42
Granted during the period 31.05 19.40 17.28
Vested during the period 20.05 17.79 17.44
Forfeited or expired during the period 18.34 9.87
Nonvested, ending $ 24.09 $ 18.65 $ 17.31