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Interest-Rate Swaps (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Interest rate swaps        
Derivative [Line Items]        
Net Gain or Loss recognized in earnings $ 0 $ 0 $ 0 $ 0