Exhibit 12.1

	Nine  Months Ended December 31, 2010
				Fiscal Year Ended March 31,
				2010			2009			2008			2007			2006
Earnings (1):
Earnings before income taxes		31,608			39,297			62,183			144,384			304,288			241,066
Add: Fixed charges		13,665			18,480			24,714			20,866			12,050			8,675
Add: Amortization of capitalized interest and FIN 48 Interest		69			3,857			5,358			6,597			30			—
Add: Cash distributions from equity method investments		20,250			29,750			33,000			37,750			29,000			27,250
Subtract: Income from equity method investments		(17,868	)		(24,157	)		(32,426	)		(33,982	)		(32,765	)		(26,917	)
Total Earnings		47,724			67,227			92,829			175,615			312,603			250,074
Fixed Charges (2):
Interest expense		13,437			18,180			24,433			20,530			11,709			8,290
Interest component of rent expense		228			300			281			336			341			385
Total Fixed Charges		13,665			18,480			24,714			20,866			12,050			8,675
Ratio of Earnings to Fixed Charges		3.5x			3.6x			3.8x			8.4x			25.9x			28.8x

(1) Earnings represent earnings before income taxes and before income from equity method investments plus: (a) fixed charges; and (b) cash distributions from equity method investments.

(2) Fixed charges include: (a) interest expense, whether expensed or capitalized, less interest accrued for uncertain tax positions; and (b) the portion of operating rental expense which management believes is representative of the interest component of rent expense.