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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock-based Compensation, Stock Options and Stock Appreciation Rights Award Activity
The following table summarizes the grants awarded during the nine months ended September 30, 2017:
Grant date
 
Restricted
stock
 
Grant date fair
value of
restricted stock
 
Stock options
 
Grant date
fair value of
stock
options
 
Performance
shares
 
Grant date fair
value of
performance
shares
January 18, 2017
 
236,581

 
$
11.47

 
—

 
$
—

 
316,213

 
$
11.58

March 7, 2017
 
542,621

 
$
7.60

 
14,820

 
$
3.91

 
—

 
$
—


The following options and stock appreciation rights were exercisable during the nine months ended September 30, 2017:
Award Type
 
Number of 
Exercised Units
 
Weighted Average
Exercised Price
 
Number of Exercisable Units
 
Weighted Average
Exercisable Price
Stock options
 
26,966

 
$
3.28

 
427,730

 
$
13.62

Stock appreciation rights
 
—

 
$
—

 
42,152

 
$
14.14