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Short-Term Debt (Details Textual) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Short-term debt $ 73,000 $ 84,200
Unused Credit Lines Amount 167,988  
Unused Credit Lines Amount, Expired Amount $ 6,887  
Minimum [Member]
    
Short-term Debt, Percentage Bearing Variable Interest Rate 0.42% 0.45%
Maximum [Member]
    
Short-term Debt, Percentage Bearing Variable Interest Rate 0.57% 0.70%