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Long- Term Debt to Affiliated Trust Long-Term Debt to Affiliated Trust (Tables)
 3 Months Ended
Mar. 31, 2020
Long-Term Debt to Affiliated Trust [Abstract]  
Schedule Of Distribution Rates Paid [Table Text Block]
The distribution rates paid were as follows during the three months ended March 31, 2020 and the year ended December 31, 2019:
 
March 31,
 
December 31,
 
2020
 
2019
Low distribution rate
2.46
%
 
2.79
%
High distribution rate
2.79
%
 
3.61
%
Distribution rate at the end of the period
2.46
%
 
2.79
%