Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2012

Summary of Carrying Values and Estimated Fair Values of Senior Convertible Notes

The following is a summary of the carrying values and estimated fair values of the Company’s senior convertible notes due in 2013 and 2015 (in millions).

	December 31, 2011				December 31, 2012
	Carrying value		Estimated fair value		Carrying value		Estimated fair value
2013 notes	$	113.9	$	61.0	$	114.4	$	81.9
2015 notes	$	96.8	$	60.8	$	97.6	$	63.2

Summary of Changes in Fair Value of Company's Level Three Forward Purchase Contracts

The following roll-forward provides a summary of the changes in fair value of the Company’s Level 3 forward purchase contracts during the year ended December 31, 2012 (in thousands) :

	The February 2012 Forward Purchase Contract			The October 2012 Forward Purchase Contract			Total
Beginning Balance	$	—		$	—		$	—
Issuance		1,080			28,237			29,317
Adjustments to fair value included in other income (expense)		12,011			(13,248	)		(1,237	)
Transfers to additional paid-in-capital		(13,091	)		(14,989	)		(28,080	)
Ending Balance	$	—		$	—		$	—