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Stock Based Compensation (Tables)
 6 Months Ended
Jun. 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 six months ended June 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

 

 

(106,885

)

 

$

58.34

 

Forfeited

 

 

(28,941

)

 

$

30.68

 

Nonvested at June 30, 2016

 

 

364,738

 

 

$

29.07