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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Stock-based Compensation, Stock Options and Stock Appreciation Rights Award Activity
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
May 13, 2015
 
1,127,814

 
$
5.57

 
310,028

 
$
2.65

 
809,293

 
$
6.97

July 1, 2015
 
22,897

 
$
5.35

 
—

 
$
—

 
—

 
$
—

Award Type
 
Number of 
Exercised Units
 
Weighted Average
Exercised Price
 
Number of Exercisable Units
 
Weighted Average
Exercisable Price
Stock options
 
—

 
$
—

 
322,117

 
$
19.96

Stock appreciation rights
 
—

 
$
—

 
46,572

 
$
14.06