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Investments (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Amortized cost, Due in less than one year $ 16,168  
Amortized cost, Due after one year but within five years 134,263  
Amortized cost, Due after five years but within ten years 63,453  
Amortized cost, Due after ten years 12,196  
Amortized cost, Total 226,682  
Estimated fair value, Due in less than one year 16,252  
Estimated fair value, Due after one year but within five years 136,233  
Estimated fair value, Due after five years but within ten years 65,716  
Estimated fair value, Due after ten years 12,778  
Estimated fair value, Total 231,986  
Common Stock [Member]
    
Amortized cost, Total 602  
Estimated fair value, Total $ 1,007 $ 902