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Short-Term Debt (Details Textual) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Short-term Debt [Line Items]    
Short-term debt $ 105,500 $ 73,000
Unused Credit Lines Amount 204,660  
Unused Credit Lines Amount, Expired Amount $ 6,710  
Minimum [Member]
    
Short-term Debt [Line Items]    
Short-term Debt, Percentage Bearing Variable Interest Rate 0.42% 0.42%
Maximum [Member]
    
Short-term Debt [Line Items]    
Short-term Debt, Percentage Bearing Variable Interest Rate 0.45% 0.57%