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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2014
Compensation and Retirement Disclosure [Abstract]  
Components of net periodic benefit cost
 
Pension Benefits
 
Other Postretirement Benefits
 
Three Months Ended June 30,
 
Three Months Ended June 30,
 
2014
2013
 
2014
2013
Service cost
$
1

$
—

 
$
—

$
—

Interest cost
63

59

 
3

2

Expected return on plan assets
(82
)
(78
)
 
(4
)
(4
)
Amortization of prior service credit
—

—

 
(1
)
(1
)
Amortization of actuarial loss
11

15

 
1

1

Net periodic benefit
$
(7
)
$
(4
)
 
$
(1
)
$
(2
)