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Long- Term Debt to Affiliated Trust Long-Term Debt to Affiliated Trust (Tables)
 3 Months Ended
Mar. 31, 2017
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, 2017 and the year ended December 31, 2016:
 
March 31,
 
December 31,
 
2017
 
2016
Low distribution rate
1.81
%
 
1.29
%
High distribution rate
1.93
%
 
1.81
%
Distribution rate at the end of the period
1.93
%
 
1.81
%