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Share-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2016
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
 
Six Months Ended
 
June 30,
 
June 30,
 
2016
 
2015
 
2016
 
2015
Equity-classified awards:
 
 
 
 
 
 
 
Stock option awards
$
155

 
$
387

 
$
(147
)
 
$
780

Common, deferred and restricted stock and stock unit awards
(3,476
)
 
729

 
(3,775
)
 
1,326

 
(3,321
)
 
1,116

 
(3,922
)
 
2,106

Liability-classified awards
(12
)
 
(214
)
 
(19
)
 
165

 
$
(3,333
)
 
$
902

 
$
(3,941
)
 
$
2,271