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Equity-Based Compensation Plan (Tables)
12 Months Ended
Dec. 31, 2014
Share Based Compensation Abstract  
Schedule Of Share Based Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range Text Block
 Year Ended December 31,
 2014 2013 2012
   Weighted   Weighted   Weighted
 Number Average Number Average Number Average
 Of Exercise Of Exercise Of Exercise
 Options  Price  Options  Price  Options  Price
Beginning of period 908,118 $ 14.46  922,593 $ 14.50  786,704 $ 15.02
Options granted 193,100   16.10  196,000   14.52  204,543   11.83
Options exercised (54,397)   11.86  (34,396)   12.65  (32,954)   11.98
Options forfeited (158,250)   19.29  (176,079)   15.11  (35,700)   11.93
End of period 888,571 $ 14.12  908,118 $ 14.46  922,593 $ 14.50

  Outstanding  Exercisable
        Weighted      
        Average      
     Weighted Contract Life    Weighted
  Number of Average Remaining Number of Average
Range of Exercise Prices Options Exercise Price (Years) Options Exercise Price
$5.63 to $8.45   9,960   8.28 4.3   9,960   8.28
8.46 to 11.26   1,000   10.29 2.6   1,000   10.29
11.27 to 14.08   478,361   11.94 5.4   291,227   12.02
14.09 to 16.90   347,200   15.34 7.7   40,000   15.11
19.72 to 22.53   1,500   21.86 3.2   1,500   21.86
22.54 to 25.35   4,700   24.13 0.1   4,700   24.13
25.36 to 28.17   45,850   27.55 0.0   45,850   27.55
    888,571 $ 14.12 6.0  394,237 $ 14.22
Aggregate Intrinsic Value $ 2,252,167      $ 956,938   
Schedule Of Share Based Payment Award Stock Options Valuation Assumptions Table Text Block

The following assumptions were used in estimating the fair value of the options granted during the years ended December 31, 2014, 2013 and 2012:

 Year Period Ended December 31,
 2014 2013 2012
Weighted average assumptions:     
Dividend yield 1.87% 1.66% 1.80%
Expected volatility 42.08% 44.34% 51.13%
Risk-free interest rate 2.38% 1.55% 1.70%
Expected life (in years) 8.0 8.0 8.0
Schedule Of Share based Compensation Restricted Stock And Restricted Stock Units Activity Table Text Block

The following table summarizes the activity in restricted units under the Omnibus Plan for the years ended December 31, 2014, 2013 and 2012:

 Year Ended December 31,
 2014 2013 2012
   Weighted   Weighted   Weighted
   Average   Average   Average
 Restricted Grant Date Restricted Grant Date Restricted Grant Date
 Units  Fair Value  Units  Fair Value  Units  Fair Value
Beginning of period 158,750 $ 13.95  197,500 $ 12.13  205,149 $ 11.27
Restricted units granted 39,200   16.10  85,700   15.86  57,350   11.85
Restricted units lapsed (37,342)   12.03  (113,367)   12.34  (47,210)   8.29
Restricted units forfeited (7,558)   14.30  (11,083)   12.87  (17,789)   11.48
End of period153,050 $ 14.95 158,750 $ 13.95 197,500 $ 12.13