Stock Award Plans (Tables)

6 Months Ended

Jun. 30, 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 June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
Stock-based compensation expense	$	6,793	$	10,099	$	16,559	$	22,609

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, 2012
Shares purchased by employees	Aggregate cost to employees		Expense recognized by the company
55,687	$	2,770,000	$	489,000