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Financial Instruments (Details Textual) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Financial Instruments (Additional Textual) [Abstract]  
Maximum time for maturing highly liquid investments 3 months
Certificates of Deposit
 
Financial Instruments (Textual) [Abstract]  
Restricted cash $ 875
Deposits
 
Financial Instruments (Textual) [Abstract]  
Restricted cash $ 2,600