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Fair Value Of Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 2017
Fair Value Of Financial Instruments [Abstract]  
Schedule Of Carrying Amounts And Estimated Fair Values Of Long-Term Debt



 

 

 

 

 

 



 

 

 

 

 

 



 

March 31,

 

December 31,



 

2017

 

2016

Carrying Amount

 

$

 1,938,864 

 

$

 1,910,633 

Estimated Fair Value

 

 

 2,009,788 

 

 

 2,018,933