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Employee Benefit Plans Level 3 (Tables)
 6 Months Ended
Jun. 30, 2015
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,
 
2015
2014
 
2015
2014
Service cost
$
1

$
1

 
$
—

$
—

Interest cost
58

63

 
3

3

Expected return on plan assets
(78
)
(82
)
 
(3
)
(4
)
Amortization of prior service credit
—

—

 
(1
)
(1
)
Amortization of actuarial loss
14

11

 
1

1

Net periodic benefit
$
(5
)
$
(7
)
 
$
—

$
(1
)