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Cash and Cash Equivalents (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash and Cash Equivalents        
Cash $ 4,670 $ 4,090    
Investments with original maturity of less than three months at the time of purchase 26,476 12,322    
Total cash and cash equivalents $ 31,146 $ 16,412 $ 24,449 $ 29,495