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Long- Term Debt to Affiliated Trust Long-Term Debt to Affiliated Trust (Tables)
 9 Months Ended
Sep. 30, 2018
Long-Term Debt to Affiliated Trust [Abstract]  
Schedule Of Distribution Rates Paid [Table Text Block]
The distribution rates paid were as follows during the nine months ended September 30, 2018 and the year ended December 31, 2017:
 
September 30,
 
December 31,
 
2018
 
2017
Low distribution rate
2.36
%
 
1.81
%
High distribution rate
3.20
%
 
2.36
%
Distribution rate at the end of the period
3.20
%
 
2.36
%