Fair Value Measurements (Tables)

12 Months Ended

Mar. 31, 2014

Fair Value Disclosures [Abstract]

Fair Value of Investment in Mandatorily Redeemable Preferred Stock and Outstanding Debt

The following table sets forth the carrying values and fair values of the Company’s investment in TVGN's mandatorily redeemable preferred stock units and outstanding debt at March 31, 2014 and March 31, 2013:

	March 31, 2014				March 31, 2013
	(Amounts in thousands)
	Carrying Value		Fair Value		Carrying Value		Fair Value
			(Level 3)				(Level 3)
Assets:
Investment in TVGN's Mandatorily Redeemable Preferred Stock Units	$	86,298	$	99,907	$	91,408	$	99,909
	Carrying Value		Fair Value		Carrying Value		Fair Value
			(Level 2)				(Level 2)
Liabilities:
October 2004 2.9375% Notes	$	115	$	111	$	348	$	276
April 2009 3.625% Notes	35,615		40,140		49,907		66,939
January 2012 4.00% Notes	36,058		41,401		36,912		48,878
April 2013 1.25% Notes	60,000		51,411		—		—
Individual production loans	418,883		418,883		404,341		403,883
Pennsylvania Regional Center production loans	—		—		65,000		65,000
Senior secured second-priority notes	225,000		223,313		432,277		477,965
July 2013 7-Year Term Loan	222,753		225,844		—		—
	$	998,424	$	1,001,103	$	988,785	$	1,062,941