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Marketable Securities - Maturity Schedule (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Amortized Cost    
Amortized Cost $ 29,308 $ 23,552
Fair Value    
Fair Value 29,306 23,553
Debt Securities [Member]
   
Amortized Cost    
Due in less than one year 22,485 15,538
Due after one year and within two years 6,823 8,014
Amortized Cost 29,308 23,552
Fair Value    
Due in less than one year 22,485 15,538
Due after one year and within two years 6,821 8,015
Fair Value $ 29,306 $ 23,553