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Share-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Share-Based Compensation Expense
The following table summarizes our share-based compensation expense recognized for the periods presented:
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2015
 
2014
 
2015
 
2014
Equity-classified awards:
 
 
 
 
 
 
 
Stock option awards
$
462

 
$
403

 
$
1,242

 
$
1,193

Common, deferred and restricted stock and stock unit awards
801

 
584

 
2,127

 
1,445

 
1,263

 
987

 
3,369

 
2,638

Liability-classified awards
(851
)
 
(360
)
 
(686
)
 
6,632

 
$
412

 
$
627

 
$
2,683

 
$
9,270