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Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2017
Earnings Per Share [Abstract]  
Schedule of weighted-average number of shares used in the calculation of basic and diluted earnings per share

 

  Three Months Ended
March 31,
 
  2017  2016 
  (in thousands) 
    
Basic weighted-average number of shares  23,450   22,791 
Effect of dilutive securities:        
Stock options  6   41 
Non-vested restricted Class B common stock  305   852 
Diluted weighted-average number of shares  23,761   23,684 
Schedule of antidilutive shares excluded from computation of earnings per share

 

  March 31, 
  2017  2016 
  (in thousands) 
    
Stock options  408    
Non-vested restricted Class B common stock      
Shares excluded from the calculation of diluted earnings per share  408     —