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Basis of Presentation (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Cost $ 2,767 $ 2,767
Gross unrealized gains 2,914   
Gross unrealized losses      
Estimated fair value 5,681 2,767
Short-term investments
    
Schedule of Available-for-sale Securities [Line Items]    
Cost 1,426  
Gross unrealized gains 2,914  
Gross unrealized losses     
Estimated fair value 4,340  
Certificates of deposit - restricted
    
Schedule of Available-for-sale Securities [Line Items]    
Cost 1,341 1,341
Gross unrealized gains      
Gross unrealized losses      
Estimated fair value 1,341 1,341
Available-for-sale securities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost   1,426
Gross unrealized gains     
Gross unrealized losses     
Estimated fair value   $ 1,426