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Earnings (Loss) Per Share (Tables)
9 Months Ended
Sep. 30, 2018
Earnings (Loss) Per Share [Abstract]  
Summary of weighted-average number of shares used in the calculation of basic and diluted earnings per share
  

Three Months Ended

September 30,

  

Nine Months Ended

September 30,

 
  2018  2017  2018  2017 
  (in thousands) 
Basic weighted-average number of shares  24,805   23,567   24,895   23,495 
Effect of dilutive securities:                
Stock options and warrants  181      68    
Non-vested restricted Class B common stock  456   591   262    
Diluted weighted-average number of shares  25,442   24,158   25,225   23,495
Summary of shares were excluded from the diluted earnings per share
  

Three Months Ended

September 30,

  

Nine Months Ended

September 30,

 
  2018  2017  2018  2017 
  (in thousands) 
Stock options and warrants  341   383   341   383 
Non-vested restricted Class B common stock           1,205 
Shares excluded from the calculation of diluted earnings per share  341   383   341   1,588