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Cash and Cash Equivalents (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash and Cash Equivalents        
Cash $ 4,090 $ 4,555    
Investments with original maturity of less than three months at the time of purchase 12,322 19,894    
Total cash and cash equivalents $ 16,412 $ 24,449 $ 29,495 $ 11,493