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BENEFIT PLANS | 3 Months Ended
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Mar. 31, 2017
BENEFIT PLANS [Abstract] |
BENEFIT PLANS | NOTE H: BENEFIT PLANS The Company provides a qualified defined benefit pension to eligible employees and retirees, other post-retirement health and life insurance benefits to certain retirees, an unfunded supplemental pension plan for certain key executives, and an unfunded stock balance plan for certain of its nonemployee directors. The Company accrues for the estimated cost of these benefits through charges to expense during the years that employees earn these benefits. The Company made a $2.9 million contribution to its defined benefit pension plan in the first quarter of 2017. The net periodic (benefit) cost for the three months ended March 31, 2017 and 2016 is as follows:
|  | Pension Benefits |  |  | Post-retirement Benefits |
|  | Three Months Ended March 31, |  |  | Three Months Ended March 31, |
(000's omitted) |  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Service cost |  | $ | 1,039 |  |  | $ | 1,026 |  |  | $ | 0 |  |  | $ | 0 |
Interest cost |  |  | 1,361 |  |  |  | 1,406 |  |  |  | 19 |  |  |  | 20 |
Expected return on plan assets |  |  | (3,121 | ) |  |  | (2,960 | ) |  |  | 0 |  |  |  | 0 |
Amortization of unrecognized net loss |  |  | 263 |  |  |  | 377 |  |  |  | 2 |  |  |  | (1 | )
Amortization of prior service cost |  |  | 14 |  |  |  | 11 |  |  |  | (45 | ) |  |  | (45 | )
Net periodic (benefit) cost |  | $ | (444 | ) |  | $ | (140 | ) |  | $ | (24 | ) |  | $ | (26 | )

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