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Marketable Securities Marketable Securities Textuals (Details) (USD $)
9 Months Ended
Sep. 30, 2013
Marketable Securities [Abstract]  
Available-for-sale securities maturities, next twelve months $ 47,800,000
Available-for-sale securities, sold 0
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value $ 0