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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2013
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,
 
2013
2012
 
2013
2012
Service cost
$
—

$
24

 
$
—

$
1

Interest cost
59

61

 
2

3

Expected return on plan assets
(78
)
(78
)
 
(4
)
(3
)
Amortization of prior service credit
—

(3
)
 
(1
)
(1
)
Amortization of actuarial loss
15

66

 
1

—

Settlements
—

(11
)
 
—

(1
)
Net periodic benefit cost
$
(4
)
$
59

 
$
(2
)
$
(1
)

 
Pension Benefits
 
Other Postretirement Benefits
 
Six Months Ended June 30,
 
Six Months Ended June 30,
 
2013
2012
 
2013
2012
Service cost
$
—

$
50

 
$
—

$
2

Interest cost
119

124

 
5

8

Expected return on plan assets
(157
)
(156
)
 
(7
)
(7
)
Amortization of prior service credit
—

(5
)
 
(3
)
(1
)
Amortization of actuarial loss
29

119

 
1

—

Settlements
—

(11
)
 
—

(1
)
Net periodic benefit cost
$
(9
)
$
121

 
$
(4
)
$
1


The income in 2013 is a result of the expected return on plan assets more than offsetting the lower expenses due to the announced plan freeze. Lower expenses are primarily due to a change in the amortization period resulting in lower actuarial losses.