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Investments (Tables)
3 Months Ended
Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Investments
    Note        
    receivable-        
Description   current     Investments  
    (in thousands)  
Balance at December 31, 2014   $ 150     $ 3,880  
Total gains or (losses) (realized or unrealized)            
Purchases            
Sales            
Transfers            
Balance at March 31, 2015   $ 150     $ 3,880