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Stock Based Compensation (Tables)
6 Months Ended
Jun. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Rollforward of Nonvested stock options, deferred stock options, and restricted stock units
Stock Option, Deferred Stock Unit and Restricted Stock Unit awards activity under the Omnibus Equity Incentive Plan for the six months ended June 30, 2019 was as follows:
Stock options
 
Number
of Shares
 
Weighted-
Average
Exercise
Price
Outstanding unvested as of December 31, 2018
968,720

 
15.68

    Granted
207,000

 
13.03

    Vested
(175,410
)
 
15.37

    Forfeited
(52,622
)
 
15.00

Outstanding unvested as of June 30, 2019
947,688

 
15.20

Deferred Stock Unit and Restricted Stock Unit awards
 
Number
of Shares
 
Weighted-
Average
Grant Date
Fair Value
Outstanding unvested as of December 31, 2018
27,570

 
12.88

    Granted
240,564

 
12.90

    Vested
(6,653
)
 
13.42

Outstanding unvested as of June 30, 2019
261,481

 
12.95