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Pension and Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2013
Pension and Other Postretirement Benefit Plans [Abstract]  
Components of net periodic benefit cost
Components of net benefit cost charged to income for the three months ended March 31:

 
Pension Benefits
 
 
Other Benefits
 
 
2013
 
 
2012
 
 
2013
 
 
2013
 
Service cost-benefits earned during the period
 
$
286
 
 
$
517
 
 
$
142
 
 
$
115
 
Interest cost on projected benefit obligation
 
 
2,624
 
 
 
2,831
 
 
 
890
 
 
 
974
 
Expected return on plan assets
 
 
(2,988
)
 
 
(2,988
)
 
 
—
 
 
 
—
 
Amortization of prior service (credit) cost
 
 
11
 
 
 
11
 
 
 
—
 
 
 
—
 
Amortization of (gain)/loss
 
 
663
 
 
 
270
 
 
 
26
 
 
 
(8
)
Total benefits cost charged to income
 
$
596
 
 
$
641
 
 
$
1,058
 
 
$
1,081