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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Liabilities:    
Short-term debt $ 105,500 $ 73,000
Fair Value, Inputs, Level 1 [Member]
    
Cash and cash equivalents:    
Time deposits with original maturities less than three months 35,684 45,000
Marketable securities available-for-sale:    
Time deposit with original maturities more than three months 0 0
Restricted marketable securities:    
Time deposits with original maturities of more than three months 0 0
Total assets 35,684 45,000
Liabilities:    
Short-term debt 0 0
Other current liabilities:    
Warrant obligation 0  
Total liabilities 0 0
Fair Value, Inputs, Level 2 [Member]
    
Cash and cash equivalents:    
Time deposits with original maturities less than three months 0 0
Marketable securities available-for-sale:    
Time deposit with original maturities more than three months 788 172
Restricted marketable securities:    
Time deposits with original maturities of more than three months 3,034 1,273
Total assets 3,822 1,445
Liabilities:    
Short-term debt 105,500 73,000
Other current liabilities:    
Warrant obligation 0  
Total liabilities 105,500 73,000
Fair Value, Inputs, Level 3 [Member]
    
Cash and cash equivalents:    
Time deposits with original maturities less than three months 0 0
Marketable securities available-for-sale:    
Time deposit with original maturities more than three months 0 0
Restricted marketable securities:    
Time deposits with original maturities of more than three months 0 0
Total assets 0 0
Liabilities:    
Short-term debt 0 0
Other current liabilities:    
Warrant obligation 1,255  
Total liabilities $ 1,255 $ 0