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Equity Investments (Tables)
3 Months Ended
Jun. 30, 2012
Tres Amigas [Member]
 
Schedule of Equity Method Investments [Line Items]  
Schedule Of Net Investment Activity
Balance at April 1, 2012 $ 3,859  
Minority interest in net losses   (227 )
Balance at June 30, 2012 $ 3,632  
Blade Dynamics Ltd. [Member]
 
Schedule of Equity Method Investments [Line Items]  
Schedule Of Net Investment Activity
Balance at April 1, 2012 $ 6,083  
Minority interest in net losses   (584 )
Net foreign exchange rate impact   (350 )
Balance at June 30, 2012 $ 5,149