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Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2012
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Credit
The following table provides the components of the Company’s net periodic benefit cost (credit) for the three and six months ended June 30, 2012 and 2011, respectively.
 
Pension Benefits
 
Three Months Ended June 30,
Six Months Ended June 30,
 
2012
2011
2012
2011
Interest cost
$
2,547

$
3,164

$
5,347

$
6,354

Expected return on plan assets
(3,097
)
(3,727
)
(6,709
)
(7,250
)
Settlement loss
1,540

403

1,540

403

Amortization of net loss
125

—

384

—

Net periodic benefit cost (credit)
$
1,115

$
(160
)
$
562

$
(493
)