Stock Award Plans (Tables)

3 Months Ended

Mar. 31, 2012

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

A summary of our total compensation expense recognized in our statements of operations for stock-based compensation is as follows (in thousands):

	Three Months Ended March 31,
	2012		2011
Stock-based compensation expense	$	9,766	$	12,510

Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity

The following table summarizes employee stock purchase plan activity for the period:

Three Months Ended March 31, 2012
Shares purchased by employees		Aggregate cost to employees		Expense recognized by the company
	98,327	$	5,473,520	$	965,915