Convertible Senior Notes (Tables)

9 Months Ended

Sep. 30, 2011

Table Text Block Supplement [Abstract]

Schedule of Convertible Senior Notes Libility and Equity Components

	Liability Component Principal Amount		Liability Component Net Carrying Amount		Liability Component Unamortized Discount		Equity Component Carrying Amount
$	236	$	236	$	0	$	35,515

Schedule of Convertible Senior Notes Interest Expense

		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2011		2010		2011		2010
Notes contractual interest expense	$	755	$	769	$	2,266	$	2,321
Amortization of debt discount		2,021		2,006		6,032		5,713
Amortization of debt issuance costs		137		138		412		412
Total	$	2,913	$	2,913	$	8,710	$	8,446