Convertible Debt (Tables)

12 Months Ended

Dec. 31, 2011

Convertible Debt [Abstract]

Net Carrying Amount of the Liability Component of Convertible Notes

The net carrying amount of the liability component of the Notes as of December 31, 2011 consists of the following:

	2011
Total convertible senior notes - par	$400,000
Unamortized discount	124,981
	$275,019

Interest Expense Associated with Convertible Notes

Total interest expense associated with the Notes consisted of the following for the year ended December 31, 2011:

	2011
Contractual coupon interest rate	$1,455
Amortization of discount and note issuance costs	3,944
	$5,399