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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2012
Compensation and Retirement Disclosure [Abstract]  
Components of net periodic benefit cost
 
Pension Benefits
 
Other Postretirement Benefits
 
Three Months Ended
September 30,
 
Three Months Ended
September 30,
 
2012
 
2011
 
2012
 
2011
Service cost
$
20

 
$
24

 
$
—

 
$
2

Interest cost
64

 
64

 
3

 
5

Expected return on plan assets
(78
)
 
(74
)
 
(4
)
 
(3
)
Amortization of prior service credit
(2
)
 
(2
)
 
(2
)
 
(1
)
Amortization of actuarial loss
52

 
40

 
—

 
—

Curtailment gain due to plan freeze
—

 
—

 
—

 
—

Net periodic benefit cost
$
56

 
$
52

 
$
(3
)
 
$
3


 
Pension Benefits
 
Other Postretirement Benefits
 
Nine Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2012
 
2011
 
2012
 
2011
Service cost
$
70

 
$
76

 
$
2

 
$
4

Interest cost
188

 
194

 
11

 
15

Expected return on plan assets
(234
)
 
(223
)
 
(11
)
 
(10
)
Amortization of prior service credit
(7
)
 
(7
)
 
(3
)
 
(1
)
Amortization of actuarial loss
171

 
119

 
—

 
—

Curtailment gain due to plan freeze
(11
)
 
—

 
—

 
—

Net periodic benefit cost
$
177

 
$
159

 
$
(1
)
 
$
8