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Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 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 year ended December 31, 2017 is presented below:

 

 

 

 

 

 

 

Weighted-

 

 

 

 

 

 

 

Average

 

 

 

 

 

 

 

Grant-Date

 

 

 

 

 

 

 

Fair Value

 

 

 

Shares

 

 

Per Share

 

Nonvested at January 1, 2017

 

 

339,140

 

 

$

28.59

 

Granted

 

 

297,685

 

 

$

10.30

 

Vested

 

 

(145,643

)

 

$

36.69

 

Forfeited

 

 

(50,063

)

 

$

17.19

 

Nonvested at December 31, 2017

 

 

441,119

 

 

$

14.87