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Segment Information Segment Information (Narrative) (Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting [Abstract]    
Revenue from top 10 customers 95.00%leu_Revenuefromtop10customers  
Revenue from top 3 customers 62.00%leu_Revenuefromtop3customers  
Revenue from first customer over 10 percent 31.00%leu_Revenuefromfirstcustomerover10percent  
Revenue from second customer over 10 percent 18.00%leu_Revenuefromsecondcustomerover10percent  
Revenue from third customer over 10 percent 13.00%leu_Revenuefromthirdcustomerover10percent  
Revenue from fourth customer over 10 percent   20.00%leu_Revenuefromfourthcustomerover10percent