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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2013
Asset Retirement Obligation Disclosure [Abstract]  
Schedule Of Changes In Asset Retirement Obligation
 
2013
 
2012
 
2011
Asset retirement obligation at beginning of year
$
3,168

 
$
3,513

 
$
3,887

Liability settled
(263
)
 
(559
)
 
(612
)
Accretion expense (income)
(46
)
 
214

 
238

Asset retirement obligation at end of year
$
2,859

 
$
3,168

 
$
3,513