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Equity Investments (Schedule Of Net Investment Activity) (Details) (USD $) In Thousands	3 Months Ended				3 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011 Blade Dynamics Ltd. [Member]	Aug. 12, 2010 Blade Dynamics Ltd. [Member]	Jun. 30, 2011 Tres Amigas [Member]
Net investment activity, beginning balance			$ 7,903		$ 3,026
Purchase of minority investment				8,000	1,800
Minority interest in net losses			(426)		(191)
Net foreign exchange rate impact	1,134	(12,336)	164
Net investment activity, ending balance			$ 7,641		$ 4,635

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