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Stock Based Compensation (Tables)
9 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Rollforward of Nonvested stock options, deferred stock options, and restricted stock units
Stock Options
 
 
Number
of Shares
 
Weighted-
Average
Exercise
Price
Outstanding unvested as of January 1, 2018
 

 

    Granted
 
979,790

 
15.67

    Forfeited
 
(11,070
)
 
15.00

Outstanding unvested as of September 30, 2018
 
968,720

 
15.68

Deferred Stock Units
 
 
Number
of Shares
 
Weighted-
Average
Grant Date
Fair Value
Outstanding unvested as of January 1, 2018
 

 

    Granted
 
28,621

 
14.84

    Vested
 
(9,129
)
 
17.94

Outstanding unvested as of September 30, 2018
 
19,492

 
13.39

Restricted Stock Units
 
 
Number
of Shares
 
Weighted-
Average
Grant Date
Fair Value
Outstanding unvested as of January 1, 2018
 

 

    Granted
 
6,740

 
13.96

Outstanding unvested as of September 30, 2018
 
6,740

 
13.96