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Short-Term Debt (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Short-term Debt [Line Items]      
Short-term debt $ 147,000 $ 138,000  
Unused Credit Lines Amount 238,695    
Unused Credit Lines Amount, Expired Amount 672    
Debt Instrument, Collateral Amount $ 176,000    
Minimum [Member] | Short-term Debt [Member]      
Short-term Debt [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 0.35% 0.32% 0.32%
Maximum [Member] | Short-term Debt [Member]      
Short-term Debt [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 0.58% 0.55% 0.45%