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Components of Net Periodic Benefit Cost (Tables)
3 Months Ended
Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Benefit Costs
 
 
Three Months Ended March 31,
 
 
(000's)
 
 
Pension Benefits
 
Post-Retirement
Health Benefits
 
 
2015
 
2014
 
2015
 
2014
Service cost
 
$
538

 
$
510

 
$
16

 
$
13

Interest cost
 
879

 
939

 
43

 
44

Expected return on plan assets
 
(863
)
 
(948
)
 

 

Amortization of transition obligation
 

 

 

 

Net amortization of prior service cost
 

 
(2
)
 

 

Net amortization of net (gain) loss
 
1,185

 
190

 

 

Net Periodic Benefit Cost
 
$
1,739

 
$
689

 
$
59

 
$
57