Share-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2012

Summary of Share-Based Compensation Expense

The following table summarizes share-based compensation expense recognized for the periods presented:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2012		2011		2012		2011
Equity-classified awards:
Stock option plans	$	950	$	1,354	$	3,108	$	4,141
Common, deferred, restricted and time-based restricted unit plans	332		466		1,125		1,488
	1,282		1,820		4,233		5,629
Liability-classified awards	165		—		790		—
	$	1,447	$	1,820	$	5,023	$	5,629