| Components of Net Periodic Benefit Costs |
The following table provides the components of net periodic benefit costs:
|
|
Three Months Ended
September 30, |
|
|
Nine Months Ended
September 30, |
|
|
|
2014 |
|
|
2013 |
|
|
2014 |
|
|
2013 |
|
|
Components of net periodic pension benefit cost |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Service cost |
$ |
7,943 |
|
|
$ |
9,468 |
|
|
$ |
23,830 |
|
|
$ |
28,404 |
|
|
Interest cost |
|
19,163 |
|
|
|
17,024 |
|
|
|
57,489 |
|
|
|
51,072 |
|
|
Expected return on plan assets |
|
(23,709 |
) |
|
|
(22,108 |
) |
|
|
(71,128 |
) |
|
|
(66,322 |
) |
|
Amortization of: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Prior service cost (credit) |
|
181 |
|
|
|
181 |
|
|
|
543 |
|
|
|
543 |
|
|
Actuarial (gain) loss |
|
(33 |
) |
|
|
9,293 |
|
|
|
(98 |
) |
|
|
27,878 |
|
|
Net periodic pension benefit cost |
$ |
3,545 |
|
|
$ |
13,858 |
|
|
$ |
10,636 |
|
|
$ |
41,575 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Components of net periodic other postretirement benefit cost |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Service cost |
$ |
2,764 |
|
|
$ |
3,820 |
|
|
$ |
8,293 |
|
|
$ |
11,461 |
|
|
Interest cost |
|
7,152 |
|
|
|
7,175 |
|
|
|
21,454 |
|
|
|
21,525 |
|
|
Expected return on plan assets |
|
(6,875 |
) |
|
|
(7,571 |
) |
|
|
(20,625 |
) |
|
|
(22,713 |
) |
|
Amortization of: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Prior service cost (credit) |
|
(548 |
) |
|
|
(548 |
) |
|
|
(1,642 |
) |
|
|
(1,642 |
) |
|
Actuarial (gain) loss |
|
(20 |
) |
|
|
2,782 |
|
|
|
(60 |
) |
|
|
8,346 |
|
|
Net periodic other postretirement benefit cost |
$ |
2,473 |
|
|
$ |
5,658 |
|
|
$ |
7,420 |
|
|
$ |
16,977 |
|
|