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Marketable Securities - Available-for-sale Securities (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Investments, Debt and Equity Securities [Abstract]    
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis $ 337  
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value 337  
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis 8,528  
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value 8,449  
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis 432  
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value 424  
Available-for-sale Securities, Amortized Cost Basis 9,297 0
Available-for-sale Securities, Fair Value Disclosure $ 9,210 $ 0