Stock Award Plans (Tables)

6 Months Ended

Jun. 30, 2011

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 June 30,				Six Months Ended June 30,
	2011		2010		2011		2010
Stock-based compensation expense	$	10,099	$	7,717	$	22,609	$	12,381

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 June 30, 2011
Shares purchased by employees		Aggregate cost to employees		Expense recognized by the company
	39,244	$	2,629,897	$	464,100