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Debt (Tables)

6 Months Ended

Jun. 30, 2011

Debt

Schedule of components of interest expenses recorded on the notes

		Three months ended						Six months ended
		June 30,						June 30,
		2011			2010			2011			2010
Contractual interest		$	1,013		$	1,089		$	2,025		$	2,178
Accretion of the discount on the Notes		490			760			1,260			1,501
Total interest expense on the Notes		$	1,503		$	1,849		$	3,285		$	3,679
Effective interest rate		6.1		%	7.0		%	6.7		%	7.0		%

Schedule of Carrying amounts of the liability and equity components of convertible notes

		June 30,			December 31,
		2011			2010
Carrying amount of the equity component		$	—		$	16,318
Principal balance of the liability component		$	—		$	105,574
Less: unamortized discount		—			4,436
Net carrying value of the liability component		$	—		$	101,138

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