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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Schedule of Derivative Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Derivative Assets    
Gross Amount $ 663 $ 1,612
Net Amounts Presented in the Statement of Financial Position 663 1,612
Net Amount 663 1,612
Derivative Liabilities    
Gross Amount 17,913 2,881
Net Amounts Presented in the Statement of Financial Position 17,913 2,881
Net Amount $ 17,913 $ 2,881