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Long-Term Investments (Details 1) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Amortized cost and estimated fair value of available-for-sale securities    
Due in one year or less, Cost $ 691  
Due in one year or less, Estimated Fair Value 693  
Due in two to ten years, Cost 820  
Due in two to ten years, Estimated Fair Value 830  
Due in ten to twenty years, Cost     
Due in ten to twenty years, Estimated Fair Value     
Due in twenty to forty years, Cost 6,100  
Due in twenty to forty years, Estimated Fair Value 5,031  
Total Cost 7,611  
Estimated Fair Value $ 6,554 $ 6,736