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Stock Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2016
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, 2016 is presented below:

 

 

 

Shares

 

 

Weighted-Average

Grant-Date

Fair Value

Per Share

 

Nonvested at January 1, 2016

 

 

266,152

 

 

$

51.39

 

Granted

 

 

234,412

 

 

$

17.27

 

Vested

 

 

(107,551

)

 

$

58.62

 

Forfeited

 

 

(29,775

)

 

$

30.66

 

Nonvested at September 30, 2016

 

 

363,238

 

 

$

28.93