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Stock Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Summary of Restricted Stock Activity and Related Information

A summary of restricted stock activity and related information for the nine months ended September 30, 2017 is presented below:

 

 

 

Shares

 

 

Weighted-Average

Grant-Date

Fair Value

Per Share

 

Nonvested at January 1, 2017

 

 

339,140

 

 

$

28.59

 

Granted

 

 

297,685

 

 

$

10.30

 

Vested

 

 

(143,762

)

 

$

36.33

 

Forfeited

 

 

(44,288

)

 

$

17.63

 

Nonvested at September 30, 2017

 

 

448,775

 

 

$

15.06