XML 31 R21.htm IDEA: XBRL DOCUMENT v3.5.0.2
Components of Net Periodic Benefit Cost (Tables)
6 Months Ended
Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Benefit Costs
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
(000's)
 
(000's)
 
 
Pension Benefits
 
Post-Retirement
Health Benefits
 
Pension Benefits
 
Post-Retirement
Health Benefits
 
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Service cost
 
$
470

 
$
538

 
$
14

 
$
16

 
$
941

 
$
1,076

 
$
27

 
$
32

Interest cost
 
932

 
879

 
46

 
43

 
1,865

 
1,758

 
93

 
87

Expected return on plan assets
 
(857
)
 
(863
)
 

 

 
(1,715
)
 
(1,726
)
 

 

Amortization of transition obligation
 

 

 

 

 

 

 

 

Net amortization of prior service cost
 

 

 

 

 

 

 

 

Net amortization of net (gain) loss
 
484

 
1,185

 

 

 
967

 
2,370

 

 

Net Periodic Benefit Cost
 
$
1,029

 
$
1,739

 
$
60

 
$
59

 
$
2,058

 
$
3,478

 
$
120

 
$
119