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Convertible Notes (Tables)

12 Months Ended

Dec. 31, 2011

Convertible Notes

Schedule of convertible notes

(Dollars in thousands)		As of December 31, 2011			As of December 31, 2010
5% Convertible Senior Notes due 2014		$	172,500		$	172,500
Zero Coupon Convertible Senior Notes due 2010			—			—
Total principal amount of convertible notes			172,500			172,500
Unamortized discount			(39,007	)		(51,000	)
Total convertible notes		$	133,493		$	121,500
Less current portion			—			—
Total long-term convertible notes		$	133,493		$	121,500

Schedule of interest expense on notes

		Years Ended December 31,
		2011			2010			2009
		(in thousands)
2014 Notes coupon interest at a rate of 5%		$	8,625		$	8,625		$	4,326
2014 Notes amortization of discount at an additional effective interest rate of 11.7%			12,622			10,116			5,626
2010 Notes amortization of discount at an effective interest rate of 8.4%			—			958			10,998
Total interest expense on convertible notes		$	21,247		$	19,699		$	20,950

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Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation.

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