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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Earnings Per Share
The following is an analysis of the calculation of basic and diluted EPS, reflecting the application of the two-class method, for the periods indicated:
 
For The Year Ended
December 31,
 
2018
 
2017
 
2016
Net income
$
53,071

 
$
28,476

 
$
40,067

Dividends and undistributed earnings allocated to participating securities(1)
(148
)
 
(118
)
 
(189
)
Net income available to common shareholders
$
52,923

 
$
28,358

 
$
39,878

Weighted-average common shares outstanding for basic EPS
15,571,387

 
15,509,665

 
15,422,160

Dilutive effect of stock-based awards(2)
54,916

 
78,682

 
82,079

Weighted-average common and potential common shares for diluted EPS
15,626,303

 
15,588,347

 
15,504,239

Earnings per common share:
  

 
  

 
  

Basic EPS
$
3.40

 
$
1.83

 
$
2.59

Diluted EPS
$
3.39

 
$
1.82

 
$
2.57

(1)
Represents dividends paid and undistributed earnings allocated to nonvested stock-based awards that contain non-forfeitable rights to dividends.
(2)
Represents the effect of the assumed exercise of stock options, vesting of restricted shares and restricted stock units, and issuance of LTIP awards that have met the performance criteria, utilizing the treasury stock method.