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Retirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2012
Compensation and Retirement Disclosure [Abstract]  
Components Of Net Periodic Benefit Cost
 
Pension Benefits
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2012
 
2011
 
2012
 
2011
Components of net periodic benefit cost
 
 
 
 
 
 
 
Service cost
$
104

 
$
97

 
$
312

 
$
289

Interest cost
191

 
189

 
573

 
568

Expected return on assets
(166
)
 
(165
)
 
(498
)
 
(493
)
Amortization of:
 
 
 
 
 
 
 
Prior service cost
3

 
3

 
10

 
10

Unrecognized net (gain) loss
63

 
39

 
187

 
115

Net periodic benefit cost
$
195

 
$
163

 
$
584

 
$
489

 
Retiree Medical and Other Benefits
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2012
 
2011
 
2012
 
2011
Components of net periodic benefit cost
 
 
 
 
 
 
 
Service cost
$
15

 
$
15

 
$
45

 
$
45

Interest cost
38

 
44

 
114

 
132

Expected return on assets
(4
)
 
(5
)
 
(12
)
 
(15
)
Amortization of:
 
 
 
 
 
 
 
Prior service cost
(7
)
 
(7
)
 
(21
)
 
(21
)
Unrecognized net (gain) loss
(2
)
 
(2
)
 
(6
)
 
(6
)
Net periodic benefit cost
$
40

 
$
45

 
$
120

 
$
135