Convertible Senior Notes (Tables)

6 Months Ended

Jun. 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
$	134,293	$	132,272	$	2,021	$	35,515

Schedule of Convertible Senior Notes Interest Expense

		Three Months Ended				Six Months Ended
		June 30,				June 30,
		2011		2010		2011		2010
Notes contractual interest expense	$	754	$	792	$	1,510	$	1,552
Amortization of debt discount		2,027		1,873		4,011		3,707
Amortization of debt issuance costs		138		136		275		274
Total	$	2,919	$	2,801	$	5,796	$	5,533