Long-term Debt (Tables)

3 Months Ended

Mar. 31, 2013

Long-term Debt

Schedule of the carrying amounts of the liability components of the Notes

	March 31, 2013							December 31, 2012
	Principal Amount		Unamortized discount(1)			Carrying Amount		Principal Amount		Unamortized discount			Carrying Amount
	($ in thousands)
Carrying amount of liability component
2.625% convertible senior notes	$	1,380,000	$	(377,945	)	$	1,002,055	$	1,380,000	$	(388,809	)	$	991,191

(1)

Unamortized discount will be amortized over the remaining life of the Notes which is 7 years.

Schedule of carrying amounts of the equity components of the Notes

	March 31, 2013			December 31, 2012
	($ in thousands)
Debt discount relating to value of conversion option	$	390,540		$	390,540
Debt issue costs		(9,124	)		(9,124	)
Total	$	381,416		$	381,416

Schedule of interest expense

	Three Months Ended March 31,
					For the Period November 10, 2005 (Inception) through March 31, 2013
	2013		2012
	($ in thousands)
Interest expense associated with accrued interest(1)	$	7,352	$	—	$	8,760
Interest expense associated with accretion of debt discount		10,864		—		12,660
Interest expense associated with amortization of debt issue costs		441		—		517
Total	$	18,657	$	—	$	21,937

(1)

The $7.4 million represents interest expense net of capitalized amount of $1.7 million.