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Stock Based Compensation (Notes)
 6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Based Compensation

(14) Stock-based compensation

Our Board of Directors granted 912,790 stock options, 19,335 deferred stock units and 6,740 restricted stock units during the three months ended June 30, 2018 under our Omnibus Equity Incentive Plan. We recognized stock-based compensation expense of $0.2 million in the six months ended June 30, 2018. As of June 30, 2018, unrecognized compensation cost related to non-vested stock options, deferred stock units and restricted stock units represents $5.5 million, which will be recognized over the remaining weighted average life of 3 years.

Stock options

                                                                                                                                                                                    

 
    
    
  
​ ​ ​ ​ ​ ​ ​ ​
 
   Number of
shares
   Weighted-
average
Exercise Price
  
​ ​ ​ ​ ​ ​ ​ ​

Outstanding unvested as of January 1, 2018

     —     —  

Granted

     912,790     15.36  

Forfeited

     (11,070 )   15.00  
​ ​ ​ ​ ​ ​ ​ ​

Outstanding unvested as of June 30, 2018

     901,720     15.36  
​ ​ ​ ​ ​ ​ ​ ​

Deferred stock units

                                                                                                                                                                                    

 
    
    
  
​ ​ ​ ​ ​ ​ ​ ​
 
   Number of
shares
   Weighted-
average grant
date fair value
  
​ ​ ​ ​ ​ ​ ​ ​

Outstanding unvested as of January 1, 2018

     —     —  

Granted

     19,335     13.20  
​ ​ ​ ​ ​ ​ ​ ​

Outstanding unvested as of June 30, 2018

     19,335     13.20  
​ ​ ​ ​ ​ ​ ​ ​

Restricted stock units

                                                                                                                                                                                    

 
    
    
  
​ ​ ​ ​ ​ ​ ​ ​
 
   Number of
shares
   Weighted-
average grant
date fair value
  
​ ​ ​ ​ ​ ​ ​ ​

Outstanding unvested as of January 1, 2018

     —     —  

Granted

     6,740     14.02  
​ ​ ​ ​ ​ ​ ​ ​

Outstanding unvested as of June 30, 2018

     6,740     14.02  
​ ​ ​ ​ ​ ​ ​ ​