Convertible Debt (Tables)

12 Months Ended

Dec. 31, 2011

Key Components of Convertible Debt

	For the Twelve Months Ended
	2011	2010	2009
Contractual interest expense on the coupon	$ 57,646	$ 60,375	$ 60,375
Amortization of the discount component recognized as interest expense	115,904	114,481	108,347
Total interest expense on the convertible debt	$ 173,550	$ 174,856	$ 168,722