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Cash, Cash Equivalents and Marketable Securities and Assets Measured at Fair Value (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash and Cash Equivalents and Marketable Securities (Textual) [Abstract]    
Impairment charges on marketable securities other-than-temporary declines $ 0  
Realized gains or losses on investments in marketable securities $ 0 $ 0