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Share-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2012
Summary of Share-Based Compensation Expense
The following table summarizes share-based compensation expense recognized for the periods presented:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2012
 
2011
 
2012
 
2011
Equity-classified awards:
 

 
 

 
 
 
 
Stock option plans
$
950

 
$
1,379

 
$
2,158

 
$
2,787

Common, deferred, restricted and time-based restricted unit plans
386

 
634

 
793

 
1,022

 
1,336

 
2,013

 
2,951

 
3,809

Liability-classified awards
553

 
—

 
625

 
—

 
$
1,889

 
$
2,013

 
$
3,576

 
$
3,809