| **Fair Value Of Financial Instruments (Tables)**                         | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                   |
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| **Fair Value Of Financial Instruments [Abstract]**                       |                                                                                                                                                                                                                                                                                                                                                              |
| Schedule Of Carrying Amounts And Estimated Fair Values Of Long-Term Debt |  

						 

						 

						 

						 

 

						 

						 

						 

						 

 

December 31,

 

						 

2014

						 

2013

Carrying amount

$
1,619,270 				
$
1,554,871 				
Estimated fair value

						 
1,694,424 				
						 
1,540,296 				
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| - Definition
Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.
+ References
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