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Short-Term Debt (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Short-term Debt [Line Items]    
Short-term debt $ 138,000 $ 180,000
Unused Credit Lines Amount 285,511  
Unused Credit Lines Amount, Expired Amount $ 23,000  
Minimum [Member] | Short-term Debt [Member]    
Short-term Debt [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 0.32% 0.32%
Maximum [Member] | Short-term Debt [Member]    
Short-term Debt [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 0.55% 0.45%