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Long-Term Debt To Affiliated Trusts (Tables)
 12 Months Ended
Dec. 31, 2016
Long-Term Debt To Affiliated Trusts [Abstract]  
Schedule of Distribution Rates Paid
The distribution rates paid were as follows during the years ended December 31:
 
2016
 
2015
 
2014
Low distribution rate
1.29
%
 
1.11
%
 
1.10
%
High distribution rate
1.81
%
 
1.29
%
 
1.11
%
Distribution rate at the end of the year
1.81
%
 
1.29
%
 
1.11
%