Debt (Tables)

12 Months Ended

Dec. 31, 2011

Debt [Abstract]

Schedule Of Long-Term Debt

	2011		2010
	(in thousands)
Convertible senior notes	$	156,098	$	144,059
Japan loan		6,431		8,573
Total debt		162,529		152,632
Current portion of long-term debt		2,573		2,450
Long-term debt	$	159,956	$	150,182

Schedule Of Principal Payments Of Debt

Payments Due by Period	Debt Principal Payment
	(in thousands)
2012	$	2,573
2013		2,571
2014		191,286
2015		—
2016		—
Beyond 2016		—
Total	$	196,430

Components Of Convertible Senior Notes

	December 31, 2011			December 31, 2010
		(in thousands)
Debt principal		$	190,000		$	190,000
Unamortized discount			33,902			45,941
Net carrying amount of the convertible debt		$	156,098		$	144,059

	For the year ended
	December 31, 2011		December 31, 2010
	(in thousands)
Contractual interest expense on the coupon	$	8,550	$	8,550
Amortization of the discount component and debt issue fees recognized as interest expense		12,853		11,319
Total interest expense on the convertible debt	$	21,403	$	19,869