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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2016
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 three months ended March 31, 2016:
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 20, 2016
 
1,030,833

 
$
1.81

 
165,479

 
$
0.86

 
1,428,314

 
$
2.92

March 21, 2016
 
685,633

 
$
5.76

 
17,772

 
$
2.84

 
8,763

 
$
4.90


The following options and stock appreciation rights were exercisable during the three months ended March 31, 2016:
Award Type
 
Number of 
Exercised Units
 
Weighted Average
Exercised Price
 
Number of Exercisable Units
 
Weighted Average
Exercisable Price
Stock options
 
—

 
$
—

 
348,279

 
$
17.68

Stock appreciation rights
 
—

 
$
—

 
46,572

 
$
14.06