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Employee Benefit Plans Level 3 (Tables)
3 Months Ended
Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Components of net periodic benefit cost
 
Pension Benefits
 
Other Postretirement Benefits
 
Three Months Ended March 31,
 
Three Months Ended March 31,
 
2015
2014
 
2015
2014
Interest cost
$
59

$
64

 
$
3

$
3

Expected return on plan assets
(78
)
(81
)
 
(3
)
(4
)
Amortization of prior service credit


 
(2
)
(2
)
Amortization of actuarial loss
15

11

 
1

1

Net periodic benefit
$
(4
)
$
(6
)
 
$
(1
)
$
(2
)