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Long-Term Debt To Affiliated Trusts (Tables)
 12 Months Ended
Dec. 31, 2012
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:
 
2012
 
2011
 
2010
Low distribution rate
1.19
%
 
1.13
%
 
1.13
%
High distribution rate
1.40

 
1.40

 
1.41

Distribution rate at the end of the year
1.19

 
1.40

 
1.17