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Marketable Securities Available-for-sale Securities (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]    
Due within one year, Amortized cost $ 5,392  
Due after one year through five years, Amortized cost 19,220  
Due after five years through ten years, Amortized cost 1,108  
Total available-for-sale securities, Amortized cost 25,720 25,490
Due within one year, Estimated fair value 5,401  
Due after one year through five years, Estimated fair value 19,451  
Due after five years through ten years, Estimated fair value 1,124  
Total available-for-sale securities, Estimated fair value $ 25,976 $ 25,526