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Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2012
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Schedule of Net Periodic Benefit (Credit) Cost
The following table provides the components of the Company’s net periodic benefit (credit) cost for the three and nine months ended September 30, 2012 and 2011, respectively.
 
Pension Benefits
 
Three Months Ended September 30,
Nine Months Ended September 30,
 
2012
2011
2012
2011
Interest cost
$
2,673

$
3,177

$
8,020

$
9,530

Expected return on plan assets
(3,355
)
(3,625
)
(10,064
)
(10,875
)
Settlement loss
—

—

1,540

403

Amortization of net loss
192

—

576

—

Net periodic benefit (credit) cost
$
(490
)
$
(448
)
$
72

$
(942
)