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Investments (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost, Due in less than one year $ 14,757  
Amortized cost, Due after one year but within five years 174,204  
Amortized cost, Due after five years but within ten years 80,231  
Amortized cost, Due after ten years 31,651  
Amortized cost, Total 301,445  
Estimated fair value, Due in less than one year 14,863  
Estimated fair value, Due after one year but within five years 174,544  
Estimated fair value, Due after five years but within ten years 80,206  
Estimated fair value, Due after ten years 31,180  
Estimated fair value, Total 301,892 300,246
Common Stock [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost, Total 602  
Estimated fair value, Total $ 1,099 $ 1,103