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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of unvested restricted stock awards

The following tables summarize the unvested restricted stock awards activity for the three months ended March 31, 2018 and 2017.

 

    Three Months Ended March 31,  
    2018     2017  
Perfomance Awards   Shares     Weighted-Average Grant Date Fair Value     Shares     Weighted-Average Grant Date Fair Value  
                         
Unvested at beginning     62,338     $ 50.45       33,226     $ 42.60  
Issued     42,533       60.45       36,523       57.49  
Forfeited     (5,913 )     50.28       —       —  
Vested     —       —       —       —  
Unvested at end     98,958     $ 54.76       69,749     $ 50.40  

 

    Three Months Ended March 31,  
    2018     2017  
Time Vested Awards   Shares     Weighted-Average Grant Date Fair Value     Shares     Weighted-Average Grant Date Fair Value  
                         
Unvested at beginning     164,043     $ 53.57       262,966     $ 33.60  
Issued     94,344       60.45       91,097       62.70  
Forfeited     (5,165 )     55.60       (371 )     42.93  
Vested     (77,384 )     49.67       (176,134 )     28.73  
Unvested at end     175,838     $ 58.92       177,558     $ 53.34  
Schedule of activity of stock options

Below is a summary of stock option activity for the three months ended March 31, 2018 and 2017. The information excludes restricted stock units and awards.

 

    Three Months Ended March 31,  
    2018     2017  
    Shares     Weighted-Average Exercise Price     Shares     Weighted-Average Exercise Price  
                         
Beginning balance     143,224     $ 9.13       216,859     $ 8.80  
Issued     —       —       —       —  
Exercised     (32,230 )     10.48       (2,675 )     24.67  
Forfeited     (500 )     24.86       —       —  
Expired     —       —       —       —  
Ending balance     110,494     $ 8.67       214,184     $ 8.60  
Schedule of stock option by exercise price range

The following summarizes information about stock options outstanding at March 31, 2018. The information excludes restricted stock units and awards.

 

                Weighted-Average 
Outstanding:   Stock Options   Weighted-Average   Remaining 
Range of Exercise Prices   Outstanding   Exercise Price   Contractual Life 
$5.76   $10.72    97,995   $5.76    0.78 
$10.73   $11.40    5,089    11.17    3.63 
$11.41   $24.86    660    20.03    4.82 
$24.87   $49.91    6,750    47.83    7.87 
           110,494   $8.67    1.36 

 

Exercisable:   Stock Options   Weighted-Average 
Range of Exercise Prices   Exercisable   Exercise Price 
$5.76   $10.72    80,646   $5.76 
$10.73   $11.40    5,089    11.17 
$11.41   $24.86    660    20.03 
$24.87   $49.91    2,000    47.62 
           88,395   $7.13 

 
Schedule of valuation assumptions used for stock options

There were no grants of stock options during the three months ended March 31, 2018.

  

    Three Months Ended     Years Ended December 31,  
    March 31, 2018     2017     2016  
Expected volatility     n/a       n/a       24.23 %
Weighted-Average volatility     n/a       n/a       24.23 %
Expected dividends     —       —       —  
Expected term (in years)     n/a       n/a       7.0  
Risk-free rate     n/a       n/a       1.37 %
Weighted-average fair value (grant date)     n/a       n/a     $ 14.27