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Derivative Financial Instruments (Conversion rate swap agreement narrative) (Details 4)
Jun. 28, 2018
Jun. 27, 2018
Dec. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Derivative [Line Items]          
Liability Derivatives     $ 9,747,000   $ 9,693,000
Visa Class B Restricted Securities          
Derivative [Line Items]          
Debt Instrument, Convertible, Conversion Ratio 1.6298 1.6483      
Visa Conversion Rate Swap Agreement [Member]          
Derivative [Line Items]          
Liability Derivatives       $ 1,000,000  
Visa Class B Restricted Securities          
Derivative [Line Items]          
Liability Derivatives     $ 0